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[Search a list of Patent Appplications for class 455]  Class   455TELECOMMUNICATIONS
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[List of Patents for class 455 subclass 1]  1           INTERFERENCE SIGNAL TRANSMISSION (E.G., JAMMING)
[List of Patents for class 455 subclass 2.01]  2.01           AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING
[List of Patents for class 455 subclass 3.01]  3.01           WIRELESS DISTRIBUTION SYSTEM
[List of Patents for class 455 subclass 3.02]  3.02           Subclass 3.02 indent level is 1 Receiver for satellite broadcast
[List of Patents for class 455 subclass 3.03]  3.03           Subclass 3.03 indent level is 1 Remote control of distribution
[List of Patents for class 455 subclass 3.04]  3.04           Subclass 3.04 indent level is 2 With subscriber selection or switching
[List of Patents for class 455 subclass 3.05]  3.05           Subclass 3.05 indent level is 1 Two-way
[List of Patents for class 455 subclass 3.06]  3.06           Subclass 3.06 indent level is 1 Combined with diverse art device (e.g., audio/sound or entertainment system)
[List of Patents for class 455 subclass 400]  400           HAVING SINGLE-CHANNEL TELEPHONE CARRIER
[List of Patents for class 455 subclass 401]  401           Subclass 401 indent level is 1 Including call signaling (e.g., ringing, off-hook, dialing)
[List of Patents for class 455 subclass 402]  402           Subclass 402 indent level is 1 Over power line
[List of Patents for class 455 subclass 403]  403           RADIOTELEPHONE SYSTEM
[List of Patents for class 455 subclass 404.1]  404.1           Subclass 404.1 indent level is 1 Emergency or alarm communication
[List of Patents for class 455 subclass 404.2]  404.2           Subclass 404.2 indent level is 2 Location monitoring
[List of Patents for class 455 subclass 405]  405           Subclass 405 indent level is 1 Usage measurement
[List of Patents for class 455 subclass 406]  406           Subclass 406 indent level is 2 Billing
[List of Patents for class 455 subclass 407]  407           Subclass 407 indent level is 3 At subscriber unit
[List of Patents for class 455 subclass 408]  408           Subclass 408 indent level is 3 At remote station
[List of Patents for class 455 subclass 409]  409           Subclass 409 indent level is 2 Rental
[List of Patents for class 455 subclass 410]  410           Subclass 410 indent level is 1 Security or fraud prevention
[List of Patents for class 455 subclass 411]  411           Subclass 411 indent level is 2 Privacy, lock-out, or authentication
[List of Patents for class 455 subclass 412.1]  412.1           Subclass 412.1 indent level is 1 Message storage or retrieval
[List of Patents for class 455 subclass 412.2]  412.2           Subclass 412.2 indent level is 2 Having message notification
[List of Patents for class 455 subclass 413]  413           Subclass 413 indent level is 2 Voice mail
[List of Patents for class 455 subclass 414.1]  414.1           Subclass 414.1 indent level is 1 Special service
[List of Patents for class 455 subclass 414.2]  414.2           Subclass 414.2 indent level is 2 User location independent information retrieval
[List of Patents for class 455 subclass 414.3]  414.3           Subclass 414.3 indent level is 3 Based on request (e.g., news, weather, etc.)
[List of Patents for class 455 subclass 414.4]  414.4           Subclass 414.4 indent level is 3 Format conversion (e.g., text, audio, etc.)
[List of Patents for class 455 subclass 415]  415           Subclass 415 indent level is 2 Caller identification
[List of Patents for class 455 subclass 416]  416           Subclass 416 indent level is 2 Call conferencing
[List of Patents for class 455 subclass 417]  417           Subclass 417 indent level is 2 Call diversion
[List of Patents for class 455 subclass 418]  418           Subclass 418 indent level is 1 Programming control
[List of Patents for class 455 subclass 419]  419           Subclass 419 indent level is 2 Remote programming control
[List of Patents for class 455 subclass 420]  420           Subclass 420 indent level is 3 Control of another apparatus
[List of Patents for class 455 subclass 421]  421           Subclass 421 indent level is 1 Out-of-range indication
[List of Patents for class 455 subclass 422.1]  422.1           Subclass 422.1 indent level is 1 Zoned or cellular telephone system
[List of Patents for class 455 subclass 423]  423           Subclass 423 indent level is 2 Diagnostic testing, malfunction indication, or electrical condition measurement
[List of Patents for class 455 subclass 424]  424           Subclass 424 indent level is 3 System equipment
[List of Patents for class 455 subclass 425]  425           Subclass 425 indent level is 3 Subscriber equipment
[List of Patents for class 455 subclass 426.1]  426.1           Subclass 426.1 indent level is 2 Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.)
[List of Patents for class 455 subclass 426.2]  426.2           Subclass 426.2 indent level is 2 Wireless service for fixed premises equipment (e.g., Wireless Local Loop (WLL) Telco emulator, etc.)
[List of Patents for class 455 subclass 427]  427           Subclass 427 indent level is 2 Space satellite
[List of Patents for class 455 subclass 428]  428           Subclass 428 indent level is 3 Switching or routing
[List of Patents for class 455 subclass 429]  429           Subclass 429 indent level is 3 Cell projection
[List of Patents for class 455 subclass 430]  430           Subclass 430 indent level is 3 Ground station control
[List of Patents for class 455 subclass 431]  431           Subclass 431 indent level is 2 Airborne or aircraft
[List of Patents for class 455 subclass 432.1]  432.1           Subclass 432.1 indent level is 2 Roaming
[List of Patents for class 455 subclass 432.2]  432.2           Subclass 432.2 indent level is 3 System format conversion
[List of Patents for class 455 subclass 432.3]  432.3           Subclass 432.3 indent level is 3 Service profile
[List of Patents for class 455 subclass 433]  433           Subclass 433 indent level is 3 Home location registration (HLR) or visitor location registration (VLR) detail
[List of Patents for class 455 subclass 434]  434           Subclass 434 indent level is 2 Control or access channel scanning
[List of Patents for class 455 subclass 435.1]  435.1           Subclass 435.1 indent level is 2 Registration
[List of Patents for class 455 subclass 435.2]  435.2           Subclass 435.2 indent level is 3 System selection
[List of Patents for class 455 subclass 435.3]  435.3           Subclass 435.3 indent level is 4 Based on priority
[List of Patents for class 455 subclass 436]  436           Subclass 436 indent level is 2 Handoff
[List of Patents for class 455 subclass 437]  437           Subclass 437 indent level is 3 Mobile assisted or initiated
[List of Patents for class 455 subclass 438]  438           Subclass 438 indent level is 3 Serving site initiated
[List of Patents for class 455 subclass 439]  439           Subclass 439 indent level is 3 Handoff initiated by another source (e.g., target, user initiated, mobile switching center (MSC), or mobile telephone switching office (MTSO), etc.)
[List of Patents for class 455 subclass 440]  440           Subclass 440 indent level is 3 Based upon unit location
[List of Patents for class 455 subclass 441]  441           Subclass 441 indent level is 3 Based upon unit velocity
[List of Patents for class 455 subclass 442]  442           Subclass 442 indent level is 3 Soft handoff
[List of Patents for class 455 subclass 443]  443           Subclass 443 indent level is 3 Overlapping cells
[List of Patents for class 455 subclass 444]  444           Subclass 444 indent level is 3 Between macro and micro cells
[List of Patents for class 455 subclass 445]  445           Subclass 445 indent level is 2 Call routing (e.g., to prevent backhaul, routing efficiency, least cost, or alternate routing)
[List of Patents for class 455 subclass 446]  446           Subclass 446 indent level is 2 Including cell planning or layout
[List of Patents for class 455 subclass 447]  447           Subclass 447 indent level is 3 Frequency reuse scheme
[List of Patents for class 455 subclass 448]  448           Subclass 448 indent level is 3 Co-located systems
[List of Patents for class 455 subclass 449]  449           Subclass 449 indent level is 3 Hierarchical cell structure
[List of Patents for class 455 subclass 450]  450           Subclass 450 indent level is 2 Channel allocation
[List of Patents for class 455 subclass 451]  451           Subclass 451 indent level is 3 Hybrid allocation
[List of Patents for class 455 subclass 452.1]  452.1           Subclass 452.1 indent level is 3 Dynamic allocation
[List of Patents for class 455 subclass 452.2]  452.2           Subclass 452.2 indent level is 4 Based on service quality (e.g., bandwidth, etc.)
[List of Patents for class 455 subclass 453]  453           Subclass 453 indent level is 3 Load balancing
[List of Patents for class 455 subclass 454]  454           Subclass 454 indent level is 3 Spectrum sharing for different type of system (e.g., point-to-point microwave, television, etc.)
[List of Patents for class 455 subclass 455]  455           Subclass 455 indent level is 2 Channel seizing
[List of Patents for class 455 subclass 456.1]  456.1           Subclass 456.1 indent level is 2 Location monitoring
[List of Patents for class 455 subclass 456.2]  456.2           Subclass 456.2 indent level is 3 Based on request signal
[List of Patents for class 455 subclass 456.3]  456.3           Subclass 456.3 indent level is 3 Position based personal service
[List of Patents for class 455 subclass 456.4]  456.4           Subclass 456.4 indent level is 3 Quiet or transmission prevention mode
[List of Patents for class 455 subclass 456.5]  456.5           Subclass 456.5 indent level is 3 At system equipment (i.e., base station)
[List of Patents for class 455 subclass 456.6]  456.6           Subclass 456.6 indent level is 3 At remote station (i.e., mobile station)
[List of Patents for class 455 subclass 457]  457           Subclass 457 indent level is 3 Location display
[List of Patents for class 455 subclass 458]  458           Subclass 458 indent level is 2 Specific paging technique
[List of Patents for class 455 subclass 459]  459           Subclass 459 indent level is 3 Meet-me system
[List of Patents for class 455 subclass 460]  460           Subclass 460 indent level is 3 Auto-dialing
[List of Patents for class 455 subclass 461]  461           Subclass 461 indent level is 1 Including personal numbering system (i.e., intelligent network for subscriber tracking or follow-me subscriber feature)
[List of Patents for class 455 subclass 462]  462           Subclass 462 indent level is 1 Including private cordless extension system
[List of Patents for class 455 subclass 463]  463           Subclass 463 indent level is 2 Multi-users
[List of Patents for class 455 subclass 464]  464           Subclass 464 indent level is 2 Channel selection or allocation
[List of Patents for class 455 subclass 465]  465           Subclass 465 indent level is 1 Including public cordless extension system
[List of Patents for class 455 subclass 466]  466           Subclass 466 indent level is 1 Auxiliary data signaling (e.g., short message service (SMS))
[List of Patents for class 455 subclass 7]  7           CARRIER WAVE REPEATER OR RELAY SYSTEM (I.E., RETRANSMISSION OF SAME INFORMATION)
[List of Patents for class 455 subclass 8]  8           Subclass 8 indent level is 1 Failure compensation (e.g., spare channel)
[List of Patents for class 455 subclass 9]  9           Subclass 9 indent level is 1 Monitoring
[List of Patents for class 455 subclass 10]  10           Subclass 10 indent level is 2 Fading compensation
[List of Patents for class 455 subclass 11.1]  11.1           Subclass 11.1 indent level is 1 Portable or mobile repeater
[List of Patents for class 455 subclass 12.1]  12.1           Subclass 12.1 indent level is 2 Space satellite
[List of Patents for class 455 subclass 13.1]  13.1           Subclass 13.1 indent level is 3 With plural repeater or relay systems
[List of Patents for class 455 subclass 13.2]  13.2           Subclass 13.2 indent level is 3 With synchronizing of satellites or system
[List of Patents for class 455 subclass 13.3]  13.3           Subclass 13.3 indent level is 3 With antenna feed network or multiple antenna switching
[List of Patents for class 455 subclass 13.4]  13.4           Subclass 13.4 indent level is 3 Power control
[List of Patents for class 455 subclass 14]  14           Subclass 14 indent level is 1 With transmission line
[List of Patents for class 455 subclass 15]  15           Subclass 15 indent level is 1 Two separate way transmission
[List of Patents for class 455 subclass 16]  16           Subclass 16 indent level is 2 Simultaneous using plural repeaters at each location
[List of Patents for class 455 subclass 17]  17           Subclass 17 indent level is 1 Plural modulated carriers
[List of Patents for class 455 subclass 18]  18           Subclass 18 indent level is 1 With delay or recording
[List of Patents for class 455 subclass 19]  19           Subclass 19 indent level is 1 Common antenna
[List of Patents for class 455 subclass 20]  20           Subclass 20 indent level is 1 With frequency conversion
[List of Patents for class 455 subclass 21]  21           Subclass 21 indent level is 2 With demodulator
[List of Patents for class 455 subclass 22]  22           Subclass 22 indent level is 2 Plural conversion stages
[List of Patents for class 455 subclass 23]  23           Subclass 23 indent level is 1 Frequency or phase modulation
[List of Patents for class 455 subclass 24]  24           Subclass 24 indent level is 1 Transmitter/receiver feedback compensation
[List of Patents for class 455 subclass 25]  25           Subclass 25 indent level is 1 Directive antenna
[List of Patents for class 455 subclass 26.1]  26.1           USE OR ACCESS BLOCKING (E.G., LOCKING SWITCH)
[List of Patents for class 455 subclass 39]  39           TRANSMITTER AND RECEIVER AT SEPARATE STATIONS
[List of Patents for class 455 subclass 40]  40           Subclass 40 indent level is 1 Earth or water medium
[List of Patents for class 455 subclass 41.1]  41.1           Subclass 41.1 indent level is 1 Near field (i.e., inductive or capacitive coupling)
[List of Patents for class 455 subclass 41.2]  41.2           Subclass 41.2 indent level is 1 Short range RF communication
[List of Patents for class 455 subclass 41.3]  41.3           Subclass 41.3 indent level is 2 To output device
[List of Patents for class 455 subclass 42]  42           Subclass 42 indent level is 1 Frequency or phase modulation
[List of Patents for class 455 subclass 43]  43           Subclass 43 indent level is 2 With modification of frequencies of analog signal passed (e.g., pre-emphasis and de-emphasis)
[List of Patents for class 455 subclass 44]  44           Subclass 44 indent level is 2 With stated modulation index
[List of Patents for class 455 subclass 45]  45           Subclass 45 indent level is 2 Via subcarrier
[List of Patents for class 455 subclass 46]  46           Subclass 46 indent level is 1 Suppressed carrier wave system
[List of Patents for class 455 subclass 47]  47           Subclass 47 indent level is 1 Single or vestigial sideband system
[List of Patents for class 455 subclass 48]  48           Subclass 48 indent level is 1 Inverted sideband
[List of Patents for class 455 subclass 500]  500           Subclass 500 indent level is 1 Plural transmitters or receivers (i.e., more than two stations)
[List of Patents for class 455 subclass 501]  501           Subclass 501 indent level is 2 Noise, distortion, or singing reduction
[List of Patents for class 455 subclass 502]  502           Subclass 502 indent level is 3 Synchronized stations
[List of Patents for class 455 subclass 503]  503           Subclass 503 indent level is 4 Simulcast system
[List of Patents for class 455 subclass 504]  504           Subclass 504 indent level is 3 Fading compensation
[List of Patents for class 455 subclass 505]  505           Subclass 505 indent level is 4 Due to weather
[List of Patents for class 455 subclass 506]  506           Subclass 506 indent level is 4 Rayleigh or multipath fading
[List of Patents for class 455 subclass 507]  507           Subclass 507 indent level is 2 Central station (e.g., master, etc.)
[List of Patents for class 455 subclass 508]  508           Subclass 508 indent level is 3 Having console
[List of Patents for class 455 subclass 509]  509           Subclass 509 indent level is 3 Channel allocation
[List of Patents for class 455 subclass 510]  510           Subclass 510 indent level is 4 Plural requests (e.g., retries)
[List of Patents for class 455 subclass 511]  511           Subclass 511 indent level is 4 Control channel/voice channel conversion
[List of Patents for class 455 subclass 512]  512           Subclass 512 indent level is 4 Based on priority
[List of Patents for class 455 subclass 513]  513           Subclass 513 indent level is 4 Ranking (e.g., based on signal strength, etc.)
[List of Patents for class 455 subclass 514]  514           Subclass 514 indent level is 4 Having storage detail
[List of Patents for class 455 subclass 515]  515           Subclass 515 indent level is 3 Control channel monitoring (i.e., paging or access channel signaling) for system access
[List of Patents for class 455 subclass 516]  516           Subclass 516 indent level is 3 Channel seizing
[List of Patents for class 455 subclass 517]  517           Subclass 517 indent level is 3 To or from mobile station
[List of Patents for class 455 subclass 518]  518           Subclass 518 indent level is 4 Having talk group
[List of Patents for class 455 subclass 519]  519           Subclass 519 indent level is 5 Talk group forming (e.g., dynamic regrouping, talk group assignment)
[List of Patents for class 455 subclass 520]  520           Subclass 520 indent level is 5 On-site or multi-site trunking
[List of Patents for class 455 subclass 521]  521           Subclass 521 indent level is 4 Emergency dispatch or response
[List of Patents for class 455 subclass 522]  522           Subclass 522 indent level is 4 Transmission power control technique
[List of Patents for class 455 subclass 523]  523           Subclass 523 indent level is 4 Using radiating transmission line
[List of Patents for class 455 subclass 524]  524           Subclass 524 indent level is 4 Multiple base stations
[List of Patents for class 455 subclass 525]  525           Subclass 525 indent level is 5 Base station selection
[List of Patents for class 455 subclass 526]  526           Subclass 526 indent level is 3 Plural receivers tuned to common frequency
[List of Patents for class 455 subclass 527]  527           Subclass 527 indent level is 2 Break-in or priority override
[List of Patents for class 455 subclass 528]  528           Subclass 528 indent level is 2 Lockout or busy-idle signaling
[List of Patents for class 455 subclass 59]  59           Subclass 59 indent level is 1 Single message via plural carrier wave transmission
[List of Patents for class 455 subclass 60]  60           Subclass 60 indent level is 2 Different phases of same frequency carrier
[List of Patents for class 455 subclass 61]  61           Subclass 61 indent level is 1 Single message via plural modulation of single carrier
[List of Patents for class 455 subclass 62]  62           Subclass 62 indent level is 1 Optimum frequency selection
[List of Patents for class 455 subclass 63.1]  63.1           Subclass 63.1 indent level is 1 Distortion, noise, or other interference prevention, reduction, or compensation
[List of Patents for class 455 subclass 63.2]  63.2           Subclass 63.2 indent level is 2 System with hierarchical coverage areas
[List of Patents for class 455 subclass 63.3]  63.3           Subclass 63.3 indent level is 2 Frequency switching
[List of Patents for class 455 subclass 63.4]  63.4           Subclass 63.4 indent level is 2 Directional antenna
[List of Patents for class 455 subclass 64]  64           Subclass 64 indent level is 2 Plasma source or barrier
[List of Patents for class 455 subclass 65]  65           Subclass 65 indent level is 2 Anti-multipath
[List of Patents for class 455 subclass 66.1]  66.1           Subclass 66.1 indent level is 1 Having diverse art device
[List of Patents for class 455 subclass 67.11]  67.11           Subclass 67.11 indent level is 1 Having measuring, testing, or monitoring of system or part
[List of Patents for class 455 subclass 67.12]  67.12           Subclass 67.12 indent level is 2 Using a chamber (e.g., room testing or audio surveillance, etc.)
[List of Patents for class 455 subclass 67.13]  67.13           Subclass 67.13 indent level is 2 Noise, distortion, or unwanted signal detection (e.g., quality control, etc.)
[List of Patents for class 455 subclass 67.14]  67.14           Subclass 67.14 indent level is 2 Using a test signal
[List of Patents for class 455 subclass 67.15]  67.15           Subclass 67.15 indent level is 2 Of a microwave link or system
[List of Patents for class 455 subclass 67.16]  67.16           Subclass 67.16 indent level is 2 Phase measuring (e.g., group delay, propagation effect, etc.)
[List of Patents for class 455 subclass 67.7]  67.7           Subclass 67.7 indent level is 2 With indication (e.g., visual or voice signalling, etc.)
[List of Patents for class 455 subclass 68]  68           Subclass 68 indent level is 1 With control signal
[List of Patents for class 455 subclass 69]  69           Subclass 69 indent level is 2 Transmitter controlled by signal feedback from receiver
[List of Patents for class 455 subclass 701]  701           Subclass 701 indent level is 2 Tone coded squelch
[List of Patents for class 455 subclass 702]  702           Subclass 702 indent level is 3 Plural tones
[List of Patents for class 455 subclass 703]  703           Subclass 703 indent level is 4 Difference frequency
[List of Patents for class 455 subclass 70]  70           Subclass 70 indent level is 2 Receiver control signal originates at message transmitter
[List of Patents for class 455 subclass 71]  71           Subclass 71 indent level is 3 Frequency control
[List of Patents for class 455 subclass 72]  72           Subclass 72 indent level is 3 For compression and expansion of message signal (i.e., companding)
[List of Patents for class 455 subclass 73]  73           TRANSMITTER AND RECEIVER AT SAME STATION (E.G., TRANSCEIVER)
[List of Patents for class 455 subclass 74]  74           Subclass 74 indent level is 1 Convertible (e.g., to diverse art device)
[List of Patents for class 455 subclass 74.1]  74.1           Subclass 74.1 indent level is 2 Cordless/corded conversion
[List of Patents for class 455 subclass 75]  75           Subclass 75 indent level is 1 With frequency stabilization (e.g., automatic frequency control)
[List of Patents for class 455 subclass 76]  76           Subclass 76 indent level is 2 Synthesizer
[List of Patents for class 455 subclass 77]  77           Subclass 77 indent level is 1 With tuning
[List of Patents for class 455 subclass 78]  78           Subclass 78 indent level is 1 With transmitter-receiver switching or interaction prevention
[List of Patents for class 455 subclass 79]  79           Subclass 79 indent level is 2 Automatic (e.g., voice operated)
[List of Patents for class 455 subclass 80]  80           Subclass 80 indent level is 3 With distributed parameter coupling
[List of Patents for class 455 subclass 81]  81           Subclass 81 indent level is 4 Waveguide
[List of Patents for class 455 subclass 82]  82           Subclass 82 indent level is 3 Common antenna
[List of Patents for class 455 subclass 83]  83           Subclass 83 indent level is 2 Single antenna switched between transmitter and receiver
[List of Patents for class 455 subclass 84]  84           Subclass 84 indent level is 1 With a common signal processing stage
[List of Patents for class 455 subclass 85]  85           Subclass 85 indent level is 2 Transmitter oscillator used as detector
[List of Patents for class 455 subclass 86]  86           Subclass 86 indent level is 2 Transmitter oscillator used as local oscillator
[List of Patents for class 455 subclass 87]  87           Subclass 87 indent level is 3 Tunable or variable
[List of Patents for class 455 subclass 88]  88           Subclass 88 indent level is 1 Transceiver controlling a separate transceiver or receiver
[List of Patents for class 455 subclass 550.1]  550.1           Subclass 550.1 indent level is 1 Radiotelephone equipment detail
[List of Patents for class 455 subclass 551]  551           Subclass 551 indent level is 2 Number assignment module (NAM) detail
[List of Patents for class 455 subclass 552.1]  552.1           Subclass 552.1 indent level is 2 Operable on more than one system
[List of Patents for class 455 subclass 553.1]  553.1           Subclass 553.1 indent level is 3 Radiotelephone having plural transceivers (e.g., for analog and digital, trunking and cellular, etc.)
[List of Patents for class 455 subclass 554.1]  554.1           Subclass 554.1 indent level is 2 Remote private branch exchange (PBX) with wireless link to landline
[List of Patents for class 455 subclass 554.2]  554.2           Subclass 554.2 indent level is 2 Equipment detail for providing wireless link to fixed equipment (e.g., WLL, Telco emulator, etc.)
[List of Patents for class 455 subclass 555]  555           Subclass 555 indent level is 2 Wireless private branch exchange (PBX) (i.e., wireless link to extension unit)
[List of Patents for class 455 subclass 556.1]  556.1           Subclass 556.1 indent level is 2 Integrated with other device
[List of Patents for class 455 subclass 556.2]  556.2           Subclass 556.2 indent level is 3 Personal digitial assistant
[List of Patents for class 455 subclass 557]  557           Subclass 557 indent level is 2 Interface attached device (e.g., interface with modem, facsimile, computer, etc.)
[List of Patents for class 455 subclass 558]  558           Subclass 558 indent level is 3 Card control element
[List of Patents for class 455 subclass 559]  559           Subclass 559 indent level is 3 Smart cable
[List of Patents for class 455 subclass 560]  560           Subclass 560 indent level is 2 Switching unit detail (e.g., mobile telephone switching office (MTSO), base station controller (BSC), etc.)
[List of Patents for class 455 subclass 561]  561           Subclass 561 indent level is 2 Base station detail
[List of Patents for class 455 subclass 562.1]  562.1           Subclass 562.1 indent level is 3 Having specific antenna arrangement
[List of Patents for class 455 subclass 563]  563           Subclass 563 indent level is 2 Having voice recognition or synthesization
[List of Patents for class 455 subclass 564]  564           Subclass 564 indent level is 2 Auto-dialing or repertory dialing (e.g., using bar code, etc.)
[List of Patents for class 455 subclass 565]  565           Subclass 565 indent level is 2 Restrictive dialing circuitry
[List of Patents for class 455 subclass 566]  566           Subclass 566 indent level is 2 Having display
[List of Patents for class 455 subclass 567]  567           Subclass 567 indent level is 2 Call alerting
[List of Patents for class 455 subclass 569.1]  569.1           Subclass 569.1 indent level is 2 Hands-free or loudspeaking arrangement
[List of Patents for class 455 subclass 569.2]  569.2           Subclass 569.2 indent level is 3 In vehicle
[List of Patents for class 455 subclass 570]  570           Subclass 570 indent level is 3 Noise suppression or echo cancellation
[List of Patents for class 455 subclass 571]  571           Subclass 571 indent level is 2 Power booster
[List of Patents for class 455 subclass 572]  572           Subclass 572 indent level is 2 Power supply
[List of Patents for class 455 subclass 573]  573           Subclass 573 indent level is 3 Battery charging
[List of Patents for class 455 subclass 574]  574           Subclass 574 indent level is 3 Power conservation
[List of Patents for class 455 subclass 575.1]  575.1           Subclass 575.1 indent level is 2 Housing or support
[List of Patents for class 455 subclass 575.2]  575.2           Subclass 575.2 indent level is 3 Headgear
[List of Patents for class 455 subclass 575.3]  575.3           Subclass 575.3 indent level is 3 Foldable type
[List of Patents for class 455 subclass 575.4]  575.4           Subclass 575.4 indent level is 3 Slidable type
[List of Patents for class 455 subclass 575.5]  575.5           Subclass 575.5 indent level is 3 Antenna shielding
[List of Patents for class 455 subclass 575.6]  575.6           Subclass 575.6 indent level is 3 Attached or connected to user
[List of Patents for class 455 subclass 575.7]  575.7           Subclass 575.7 indent level is 3 Having specific antenna arrangement
[List of Patents for class 455 subclass 575.8]  575.8           Subclass 575.8 indent level is 3 Protective cover
[List of Patents for class 455 subclass 575.9]  575.9           Subclass 575.9 indent level is 3 In vehicle
[List of Patents for class 455 subclass 90.1]  90.1           Subclass 90.1 indent level is 1 Having particular application (e.g., avalanche victim assistance) of a transceiver
[List of Patents for class 455 subclass 90.2]  90.2           Subclass 90.2 indent level is 1 Having particular configuration (e.g., C.B., or walkie-talkie) of a transceiver
[List of Patents for class 455 subclass 90.3]  90.3           Subclass 90.3 indent level is 1 Having particular housing or support of a transceiver
[List of Patents for class 455 subclass 91]  91           TRANSMITTER
[List of Patents for class 455 subclass 92]  92           Subclass 92 indent level is 1 Remote control of a transmitter
[List of Patents for class 455 subclass 93]  93           Subclass 93 indent level is 1 Convertible to different type (e.g., AM to FM)
[List of Patents for class 455 subclass 94]  94           Subclass 94 indent level is 1 Alternator
[List of Patents for class 455 subclass 95]  95           Subclass 95 indent level is 1 Mobile or portable
[List of Patents for class 455 subclass 96]  96           Subclass 96 indent level is 2 Transmitter ejected from moving vehicle
[List of Patents for class 455 subclass 97]  97           Subclass 97 indent level is 2 With antenna ejection or external support
[List of Patents for class 455 subclass 98]  98           Subclass 98 indent level is 2 With aircraft, satellite, or projectile
[List of Patents for class 455 subclass 99]  99           Subclass 99 indent level is 2 With vehicle
[List of Patents for class 455 subclass 100]  100           Subclass 100 indent level is 2 Body attached or connected
[List of Patents for class 455 subclass 101]  101           Subclass 101 indent level is 1 Diversity
[List of Patents for class 455 subclass 102]  102           Subclass 102 indent level is 1 Plural modulation
[List of Patents for class 455 subclass 103]  103           Subclass 103 indent level is 1 Plural separate transmitters or channels
[List of Patents for class 455 subclass 104]  104           Subclass 104 indent level is 2 Carrier and sidebands separately transmitted
[List of Patents for class 455 subclass 105]  105           Subclass 105 indent level is 2 Common frequency
[List of Patents for class 455 subclass 106]  106           Subclass 106 indent level is 1 Modulation by absorption, shielding, or reflecting
[List of Patents for class 455 subclass 107]  107           Subclass 107 indent level is 1 With variation of antenna impedance or dimension for modulation
[List of Patents for class 455 subclass 108]  108           Subclass 108 indent level is 1 Amplitude modulation
[List of Patents for class 455 subclass 109]  109           Subclass 109 indent level is 2 Vestigial or single sideband or suppressed carrier
[List of Patents for class 455 subclass 110]  110           Subclass 110 indent level is 1 Angle modulation
[List of Patents for class 455 subclass 111]  111           Subclass 111 indent level is 2 Including distributed parameter structure
[List of Patents for class 455 subclass 112]  112           Subclass 112 indent level is 2 With frequency multiplication or division
[List of Patents for class 455 subclass 113]  113           Subclass 113 indent level is 2 With frequency control
[List of Patents for class 455 subclass 114.1]  114.1           Subclass 114.1 indent level is 1 Having harmonic radiation suppression
[List of Patents for class 455 subclass 114.2]  114.2           Subclass 114.2 indent level is 1 Noise or interference elimination
[List of Patents for class 455 subclass 114.3]  114.3           Subclass 114.3 indent level is 2 Predistortion (e.g., for power amplifier)
[List of Patents for class 455 subclass 115.1]  115.1           Subclass 115.1 indent level is 1 Measuring, testing, or monitoring of transmitter
[List of Patents for class 455 subclass 115.2]  115.2           Subclass 115.2 indent level is 2 Using a test signal
[List of Patents for class 455 subclass 115.3]  115.3           Subclass 115.3 indent level is 2 Signal strength
[List of Patents for class 455 subclass 115.4]  115.4           Subclass 115.4 indent level is 2 Having meter or indicator
[List of Patents for class 455 subclass 116]  116           Subclass 116 indent level is 1 Carrier amplitude control (e.g., voice operated on/off)
[List of Patents for class 455 subclass 117]  117           Subclass 117 indent level is 1 With electrical protection of transmitter circuit or operator
[List of Patents for class 455 subclass 118]  118           Subclass 118 indent level is 1 Frequency conversion
[List of Patents for class 455 subclass 119]  119           Subclass 119 indent level is 1 Carrier frequency stabilization
[List of Patents for class 455 subclass 120]  120           Subclass 120 indent level is 1 Including tuning
[List of Patents for class 455 subclass 121]  121           Subclass 121 indent level is 2 In antenna circuit
[List of Patents for class 455 subclass 122]  122           Subclass 122 indent level is 3 With saturable reactor
[List of Patents for class 455 subclass 123]  123           Subclass 123 indent level is 3 Automatically controlled
[List of Patents for class 455 subclass 124]  124           Subclass 124 indent level is 2 Distributed parameter device
[List of Patents for class 455 subclass 125]  125           Subclass 125 indent level is 2 Automatic adjustment of tuning
[List of Patents for class 455 subclass 126]  126           Subclass 126 indent level is 1 With feedback of modulated output signal
[List of Patents for class 455 subclass 127.1]  127.1           Subclass 127.1 indent level is 1 Power control, power supply, or bias voltage supply
[List of Patents for class 455 subclass 127.2]  127.2           Subclass 127.2 indent level is 2 Gain control
[List of Patents for class 455 subclass 127.3]  127.3           Subclass 127.3 indent level is 3 Plural amplifier stages
[List of Patents for class 455 subclass 127.4]  127.4           Subclass 127.4 indent level is 2 Dual mode (e.g., analog and digital)
[List of Patents for class 455 subclass 127.5]  127.5           Subclass 127.5 indent level is 2 Power conservation
[List of Patents for class 455 subclass 128]  128           Subclass 128 indent level is 1 With casing or housing
[List of Patents for class 455 subclass 129]  129           Subclass 129 indent level is 1 With coupled antenna
[List of Patents for class 455 subclass 130]  130           RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER
[List of Patents for class 455 subclass 131]  131           Subclass 131 indent level is 1 Frequency conversion between signal source (e.g., wave collector) and receiver
[List of Patents for class 455 subclass 132]  132           Subclass 132 indent level is 1 Plural receivers
[List of Patents for class 455 subclass 133]  133           Subclass 133 indent level is 2 With output selecting
[List of Patents for class 455 subclass 134]  134           Subclass 134 indent level is 3 By signal strength
[List of Patents for class 455 subclass 135]  135           Subclass 135 indent level is 3 By signal quality (e.g., signal to noise ratio)
[List of Patents for class 455 subclass 136]  136           Subclass 136 indent level is 3 With control (e.g., automatic gain control, automatic frequency control, etc.)
[List of Patents for class 455 subclass 137]  137           Subclass 137 indent level is 2 With output combining
[List of Patents for class 455 subclass 138]  138           Subclass 138 indent level is 3 With control (e.g., automatic gain control)
[List of Patents for class 455 subclass 139]  139           Subclass 139 indent level is 4 Frequency or phase control
[List of Patents for class 455 subclass 140]  140           Subclass 140 indent level is 2 Selectively actuated or controlled
[List of Patents for class 455 subclass 141]  141           Subclass 141 indent level is 2 Including common stage (e.g., local oscillator)
[List of Patents for class 455 subclass 142]  142           Subclass 142 indent level is 1 Convertible to different type (e.g., AM to FM)
[List of Patents for class 455 subclass 143]  143           Subclass 143 indent level is 2 With distinct signal path for each type
[List of Patents for class 455 subclass 144]  144           Subclass 144 indent level is 2 With dual purpose amplifying or other stage
[List of Patents for class 455 subclass 145]  145           Subclass 145 indent level is 1 Panoramic display
[List of Patents for class 455 subclass 146]  146           Subclass 146 indent level is 2 Plural separate paths or plural oscillators
[List of Patents for class 455 subclass 147]  147           Subclass 147 indent level is 2 Particular local oscillator control
[List of Patents for class 455 subclass 148]  148           Subclass 148 indent level is 2 With oscilloscope sweep signal derivation or control
[List of Patents for class 455 subclass 149]  149           Subclass 149 indent level is 1 Plural output (e.g., plural speakers) (not stereo)
[List of Patents for class 455 subclass 150.1]  150.1           Subclass 150.1 indent level is 1 Signal selection based on frequency (e.g., tuning)
[List of Patents for class 455 subclass 151.1]  151.1           Subclass 151.1 indent level is 2 Remote control of channel or station selection
[List of Patents for class 455 subclass 151.2]  151.2           Subclass 151.2 indent level is 3 Wireless link (sonic, RF, or infrared)
[List of Patents for class 455 subclass 151.3]  151.3           Subclass 151.3 indent level is 3 Remote oscillator tuned
[List of Patents for class 455 subclass 151.4]  151.4           Subclass 151.4 indent level is 3 Plural electronic devices controlled
[List of Patents for class 455 subclass 152.1]  152.1           Subclass 152.1 indent level is 3 Of or combined with vehicle receiver
[List of Patents for class 455 subclass 153.1]  153.1           Subclass 153.1 indent level is 3 Mechanical
[List of Patents for class 455 subclass 153.2]  153.2           Subclass 153.2 indent level is 4 With wired link
[List of Patents for class 455 subclass 154.1]  154.1           Subclass 154.1 indent level is 2 With indication of frequency, channel, or selector condition (e.g., tuning aid)
[List of Patents for class 455 subclass 154.2]  154.2           Subclass 154.2 indent level is 3 Scanning display
[List of Patents for class 455 subclass 155.1]  155.1           Subclass 155.1 indent level is 3 By meter
[List of Patents for class 455 subclass 156.1]  156.1           Subclass 156.1 indent level is 3 Audible indicator
[List of Patents for class 455 subclass 157.1]  157.1           Subclass 157.1 indent level is 3 Analog frequency indication (e.g., dial)
[List of Patents for class 455 subclass 157.2]  157.2           Subclass 157.2 indent level is 4 With light indication or bar type
[List of Patents for class 455 subclass 158.1]  158.1           Subclass 158.1 indent level is 3 Channel index indication
[List of Patents for class 455 subclass 158.2]  158.2           Subclass 158.2 indent level is 4 With electronic digital indication
[List of Patents for class 455 subclass 158.3]  158.3           Subclass 158.3 indent level is 5 Using a counter
[List of Patents for class 455 subclass 158.4]  158.4           Subclass 158.4 indent level is 4 With multiple display functions
[List of Patents for class 455 subclass 158.5]  158.5           Subclass 158.5 indent level is 4 Non-numeric display (e.g., call letters)
[List of Patents for class 455 subclass 159.1]  159.1           Subclass 159.1 indent level is 3 Variable light indication
[List of Patents for class 455 subclass 159.2]  159.2           Subclass 159.2 indent level is 4 Plural lamps
[List of Patents for class 455 subclass 160.1]  160.1           Subclass 160.1 indent level is 2 Plural tuning modes (e.g., manual and scanning, etc.)
[List of Patents for class 455 subclass 161.1]  161.1           Subclass 161.1 indent level is 2 Frequency scanning
[List of Patents for class 455 subclass 161.2]  161.2           Subclass 161.2 indent level is 3 With processor control
[List of Patents for class 455 subclass 161.3]  161.3           Subclass 161.3 indent level is 3 Using signal strength or quality
[List of Patents for class 455 subclass 162.1]  162.1           Subclass 162.1 indent level is 3 Motor activated
[List of Patents for class 455 subclass 163.1]  163.1           Subclass 163.1 indent level is 4 Reversible motor (e.g., end-stop control)
[List of Patents for class 455 subclass 164.1]  164.1           Subclass 164.1 indent level is 3 With automatic frequency control
[List of Patents for class 455 subclass 164.2]  164.2           Subclass 164.2 indent level is 4 Processor controlled (AFC)
[List of Patents for class 455 subclass 165.1]  165.1           Subclass 165.1 indent level is 3 With frequency synthesizer
[List of Patents for class 455 subclass 166.1]  166.1           Subclass 166.1 indent level is 3 With channel skipping selection
[List of Patents for class 455 subclass 166.2]  166.2           Subclass 166.2 indent level is 4 With priority channel selection
[List of Patents for class 455 subclass 167.1]  167.1           Subclass 167.1 indent level is 3 With dual sweeping
[List of Patents for class 455 subclass 168.1]  168.1           Subclass 168.1 indent level is 3 Multiband
[List of Patents for class 455 subclass 169.1]  169.1           Subclass 169.1 indent level is 3 With particular variable voltage or current tuning
[List of Patents for class 455 subclass 169.2]  169.2           Subclass 169.2 indent level is 4 With varactor diode
[List of Patents for class 455 subclass 170.1]  170.1           Subclass 170.1 indent level is 2 With mechanical or electromechanical selection
[List of Patents for class 455 subclass 171.1]  171.1           Subclass 171.1 indent level is 3 Time actuated
[List of Patents for class 455 subclass 172.1]  172.1           Subclass 172.1 indent level is 4 Including a motor
[List of Patents for class 455 subclass 173.1]  173.1           Subclass 173.1 indent level is 3 With automatic frequency control of fine tuning
[List of Patents for class 455 subclass 174.1]  174.1           Subclass 174.1 indent level is 3 With muting (e.g., silent tuning)
[List of Patents for class 455 subclass 175.1]  175.1           Subclass 175.1 indent level is 3 With carrier wave preset
[List of Patents for class 455 subclass 176.1]  176.1           Subclass 176.1 indent level is 3 Combined with band selection
[List of Patents for class 455 subclass 177.1]  177.1           Subclass 177.1 indent level is 3 Combined with other control (e.g., bandwidth, volume, gain, etc.)
[List of Patents for class 455 subclass 178.1]  178.1           Subclass 178.1 indent level is 3 With plurality of tunable circuits
[List of Patents for class 455 subclass 179.1]  179.1           Subclass 179.1 indent level is 2 Channel or station selection
[List of Patents for class 455 subclass 180.1]  180.1           Subclass 180.1 indent level is 3 Combined with band selection
[List of Patents for class 455 subclass 180.2]  180.2           Subclass 180.2 indent level is 4 UHF and VHF
[List of Patents for class 455 subclass 180.3]  180.3           Subclass 180.3 indent level is 5 With phase locked loop (PLL) tuning
[List of Patents for class 455 subclass 180.4]  180.4           Subclass 180.4 indent level is 5 Varactor tuned (e.g., varactor diode)
[List of Patents for class 455 subclass 181.1]  181.1           Subclass 181.1 indent level is 3 Time controlled
[List of Patents for class 455 subclass 182.1]  182.1           Subclass 182.1 indent level is 3 With frequency control
[List of Patents for class 455 subclass 182.2]  182.2           Subclass 182.2 indent level is 4 Automatic (AFC)
[List of Patents for class 455 subclass 182.3]  182.3           Subclass 182.3 indent level is 3 Fine tuning
[List of Patents for class 455 subclass 183.1]  183.1           Subclass 183.1 indent level is 3 With frequency synthesizer
[List of Patents for class 455 subclass 183.2]  183.2           Subclass 183.2 indent level is 4 Processor controlled
[List of Patents for class 455 subclass 184.1]  184.1           Subclass 184.1 indent level is 3 With comparing desired and existing tuning conditions
[List of Patents for class 455 subclass 185.1]  185.1           Subclass 185.1 indent level is 3 With channel information storage
[List of Patents for class 455 subclass 186.1]  186.1           Subclass 186.1 indent level is 4 With memory control or programming
[List of Patents for class 455 subclass 186.2]  186.2           Subclass 186.2 indent level is 5 Having a keyboard
[List of Patents for class 455 subclass 187.1]  187.1           Subclass 187.1 indent level is 3 Separate tuned circuits for each channel or station
[List of Patents for class 455 subclass 188.1]  188.1           Subclass 188.1 indent level is 2 Band selection
[List of Patents for class 455 subclass 188.2]  188.2           Subclass 188.2 indent level is 3 UHF and VHF
[List of Patents for class 455 subclass 189.1]  189.1           Subclass 189.1 indent level is 3 With plural separate mixer or converter circuits
[List of Patents for class 455 subclass 190.1]  190.1           Subclass 190.1 indent level is 3 With frequency conversion
[List of Patents for class 455 subclass 191.1]  191.1           Subclass 191.1 indent level is 3 With plurality of tuned circuits
[List of Patents for class 455 subclass 191.2]  191.2           Subclass 191.2 indent level is 4 Varactor tuned
[List of Patents for class 455 subclass 191.3]  191.3           Subclass 191.3 indent level is 4 With switching between stages
[List of Patents for class 455 subclass 192.1]  192.1           Subclass 192.1 indent level is 2 With frequency control
[List of Patents for class 455 subclass 192.2]  192.2           Subclass 192.2 indent level is 3 Automatic (AFC)
[List of Patents for class 455 subclass 192.3]  192.3           Subclass 192.3 indent level is 3 Fine tuning
[List of Patents for class 455 subclass 193.1]  193.1           Subclass 193.1 indent level is 2 With antenna circuit tuning
[List of Patents for class 455 subclass 193.2]  193.2           Subclass 193.2 indent level is 3 With plural resonant circuits
[List of Patents for class 455 subclass 193.3]  193.3           Subclass 193.3 indent level is 3 Including varactor diode
[List of Patents for class 455 subclass 194.1]  194.1           Subclass 194.1 indent level is 2 With muting (e.g., silent tuning)
[List of Patents for class 455 subclass 194.2]  194.2           Subclass 194.2 indent level is 3 Amplifier controlled
[List of Patents for class 455 subclass 195.1]  195.1           Subclass 195.1 indent level is 2 Variable voltage or current tuning
[List of Patents for class 455 subclass 196.1]  196.1           Subclass 196.1 indent level is 2 Including variation of local oscillator frequency
[List of Patents for class 455 subclass 197.1]  197.1           Subclass 197.1 indent level is 3 By simultaneous control with signal selection
[List of Patents for class 455 subclass 197.2]  197.2           Subclass 197.2 indent level is 4 Variable capacitor tuned
[List of Patents for class 455 subclass 197.3]  197.3           Subclass 197.3 indent level is 5 Including additional tuning circuit
[List of Patents for class 455 subclass 198.1]  198.1           Subclass 198.1 indent level is 4 Including distributed parameter control device
[List of Patents for class 455 subclass 199.1]  199.1           Subclass 199.1 indent level is 4 Discrete frequency types (e.g., channel switching)
[List of Patents for class 455 subclass 200.1]  200.1           Subclass 200.1 indent level is 2 With other control (e.g., volume, gain, bandwidth, etc.)
[List of Patents for class 455 subclass 201]  201           Subclass 201 indent level is 1 Exalted carrier
[List of Patents for class 455 subclass 202]  202           Subclass 202 indent level is 1 Suppressed carrier
[List of Patents for class 455 subclass 203]  203           Subclass 203 indent level is 1 Carrier and single sideband
[List of Patents for class 455 subclass 204]  204           Subclass 204 indent level is 1 Vestigial sideband
[List of Patents for class 455 subclass 205]  205           Subclass 205 indent level is 1 Frequency or phase modulation
[List of Patents for class 455 subclass 206]  206           Subclass 206 indent level is 2 Responsive to one of overlapping signals
[List of Patents for class 455 subclass 207]  207           Subclass 207 indent level is 2 With plural conversion
[List of Patents for class 455 subclass 208]  208           Subclass 208 indent level is 2 With synchronized or controlled local oscillator
[List of Patents for class 455 subclass 209]  209           Subclass 209 indent level is 3 Plural local oscillators or mixers
[List of Patents for class 455 subclass 210]  210           Subclass 210 indent level is 2 With carrier amplitude modulation elimination (e.g., specified limiter)
[List of Patents for class 455 subclass 211]  211           Subclass 211 indent level is 3 Combined with other function
[List of Patents for class 455 subclass 212]  212           Subclass 212 indent level is 2 With squelch or other audio output silencing
[List of Patents for class 455 subclass 213]  213           Subclass 213 indent level is 3 Using specified filter
[List of Patents for class 455 subclass 214]  214           Subclass 214 indent level is 2 With particular discriminator or detector
[List of Patents for class 455 subclass 215]  215           Subclass 215 indent level is 3 Superregenerative
[List of Patents for class 455 subclass 216]  216           Subclass 216 indent level is 2 With particular frequency division or multiplication
[List of Patents for class 455 subclass 217]  217           Subclass 217 indent level is 1 With protection circuit for receiver circuit
[List of Patents for class 455 subclass 218]  218           Subclass 218 indent level is 1 Squelch
[List of Patents for class 455 subclass 219]  219           Subclass 219 indent level is 2 With automatic gain or volume control
[List of Patents for class 455 subclass 220]  220           Subclass 220 indent level is 2 Adjustable
[List of Patents for class 455 subclass 221]  221           Subclass 221 indent level is 2 Audio responsive
[List of Patents for class 455 subclass 222]  222           Subclass 222 indent level is 2 Noise controlled
[List of Patents for class 455 subclass 223]  223           Subclass 223 indent level is 3 Short duration (noise blankers)
[List of Patents for class 455 subclass 224]  224           Subclass 224 indent level is 4 Separate broadband detector channel
[List of Patents for class 455 subclass 225]  225           Subclass 225 indent level is 2 Plural paths
[List of Patents for class 455 subclass 226.1]  226.1           Subclass 226.1 indent level is 1 Measuring or testing of receiver
[List of Patents for class 455 subclass 226.2]  226.2           Subclass 226.2 indent level is 2 Signal strength
[List of Patents for class 455 subclass 226.3]  226.3           Subclass 226.3 indent level is 2 Signal-to-noise ratio
[List of Patents for class 455 subclass 226.4]  226.4           Subclass 226.4 indent level is 2 With meter or indicator
[List of Patents for class 455 subclass 227]  227           Subclass 227 indent level is 1 Responsive to an input signal of particular predetermined frequency
[List of Patents for class 455 subclass 228]  228           Subclass 228 indent level is 2 Responsive to specified modulation (e.g., call alarm, Conelrad)
[List of Patents for class 455 subclass 229]  229           Subclass 229 indent level is 2 Responsive to carrier absence or presence
[List of Patents for class 455 subclass 230]  230           Subclass 230 indent level is 1 Local control of receiver operation
[List of Patents for class 455 subclass 231]  231           Subclass 231 indent level is 2 Applied at or for specific intervals or periods of time
[List of Patents for class 455 subclass 232.1]  232.1           Subclass 232.1 indent level is 2 Gain control
[List of Patents for class 455 subclass 233.1]  233.1           Subclass 233.1 indent level is 3 With diverse control (tone, etc.)
[List of Patents for class 455 subclass 234.1]  234.1           Subclass 234.1 indent level is 3 Automatic
[List of Patents for class 455 subclass 234.2]  234.2           Subclass 234.2 indent level is 4 Processor controlled
[List of Patents for class 455 subclass 235.1]  235.1           Subclass 235.1 indent level is 4 Forward acting
[List of Patents for class 455 subclass 236.1]  236.1           Subclass 236.1 indent level is 4 Variable conversion efficiency (variable oscillator amplitude, etc.)
[List of Patents for class 455 subclass 237.1]  237.1           Subclass 237.1 indent level is 4 Responsive to locally injected pilot
[List of Patents for class 455 subclass 238.1]  238.1           Subclass 238.1 indent level is 4 Responsive to vehicle speed
[List of Patents for class 455 subclass 239.1]  239.1           Subclass 239.1 indent level is 4 Nonlinear automatic gain control
[List of Patents for class 455 subclass 240.1]  240.1           Subclass 240.1 indent level is 5 Variable automatic gain control loop gain
[List of Patents for class 455 subclass 241.1]  241.1           Subclass 241.1 indent level is 5 Different gain stages
[List of Patents for class 455 subclass 242.1]  242.1           Subclass 242.1 indent level is 5 Delayed
[List of Patents for class 455 subclass 242.2]  242.2           Subclass 242.2 indent level is 6 Different delay for different signal stages or thresholds
[List of Patents for class 455 subclass 243.1]  243.1           Subclass 243.1 indent level is 6 Radio frequency stage only delayed
[List of Patents for class 455 subclass 244.1]  244.1           Subclass 244.1 indent level is 5 Dual time constant
[List of Patents for class 455 subclass 245.1]  245.1           Subclass 245.1 indent level is 4 Automatic gain control signal derived from information signal
[List of Patents for class 455 subclass 245.2]  245.2           Subclass 245.2 indent level is 5 Plural stages controlled
[List of Patents for class 455 subclass 246.1]  246.1           Subclass 246.1 indent level is 4 Responsive to plural inputs
[List of Patents for class 455 subclass 247.1]  247.1           Subclass 247.1 indent level is 5 Separate automatic gain control signals
[List of Patents for class 455 subclass 248.1]  248.1           Subclass 248.1 indent level is 4 Constant or controlled input impedance
[List of Patents for class 455 subclass 249.1]  249.1           Subclass 249.1 indent level is 4 Variable attenuator type
[List of Patents for class 455 subclass 250.1]  250.1           Subclass 250.1 indent level is 4 Automatic gain control to improve strong signal handling
[List of Patents for class 455 subclass 251.1]  251.1           Subclass 251.1 indent level is 4 Plural stages with different levels or bias to each stage (e.g., partial automatic gain control)
[List of Patents for class 455 subclass 252.1]  252.1           Subclass 252.1 indent level is 4 Semiconductor
[List of Patents for class 455 subclass 253.1]  253.1           Subclass 253.1 indent level is 4 Plural stages controlled with plates, screen grids, or cathodes connected in parallel
[List of Patents for class 455 subclass 253.2]  253.2           Subclass 253.2 indent level is 4 Plural amplifier stages
[List of Patents for class 455 subclass 254]  254           Subclass 254 indent level is 2 Sensitivity control
[List of Patents for class 455 subclass 255]  255           Subclass 255 indent level is 2 Local oscillator frequency control
[List of Patents for class 455 subclass 256]  256           Subclass 256 indent level is 3 Combined with other control
[List of Patents for class 455 subclass 257]  257           Subclass 257 indent level is 3 Automatic
[List of Patents for class 455 subclass 258]  258           Subclass 258 indent level is 4 Utilizing particular local oscillator control
[List of Patents for class 455 subclass 259]  259           Subclass 259 indent level is 5 Reference oscillator or source
[List of Patents for class 455 subclass 260]  260           Subclass 260 indent level is 6 Phase lock loop or frequency synthesizer
[List of Patents for class 455 subclass 261]  261           Subclass 261 indent level is 5 Variable reactance (e.g., reactance tube)
[List of Patents for class 455 subclass 262]  262           Subclass 262 indent level is 6 Voltage controlled capacitor
[List of Patents for class 455 subclass 263]  263           Subclass 263 indent level is 5 Discriminator or detector
[List of Patents for class 455 subclass 264]  264           Subclass 264 indent level is 5 Voltage control of oscillator
[List of Patents for class 455 subclass 265]  265           Subclass 265 indent level is 4 With local oscillator synchronization or locking
[List of Patents for class 455 subclass 266]  266           Subclass 266 indent level is 2 Selectivity or bandwidth control
[List of Patents for class 455 subclass 267]  267           Subclass 267 indent level is 2 Tone control
[List of Patents for class 455 subclass 268]  268           Subclass 268 indent level is 2 Fidelity control
[List of Patents for class 455 subclass 269]  269           Subclass 269 indent level is 1 With wave collector (e.g., antenna)
[List of Patents for class 455 subclass 270]  270           Subclass 270 indent level is 2 Power-line or receiver element used as wave collector
[List of Patents for class 455 subclass 271]  271           Subclass 271 indent level is 2 Suppression of radiation from receiver via wave collector
[List of Patents for class 455 subclass 272]  272           Subclass 272 indent level is 2 Plural separate collectors
[List of Patents for class 455 subclass 273]  273           Subclass 273 indent level is 3 With particular output combining
[List of Patents for class 455 subclass 274]  274           Subclass 274 indent level is 4 Loop or coil antenna
[List of Patents for class 455 subclass 275]  275           Subclass 275 indent level is 3 With frequency changing or selecting in the output path of one or more collectors
[List of Patents for class 455 subclass 276.1]  276.1           Subclass 276.1 indent level is 3 With phase shifting, correcting, or regulating in the output path of one or more collectors
[List of Patents for class 455 subclass 277.1]  277.1           Subclass 277.1 indent level is 3 Selectively or alternately connected to receiver
[List of Patents for class 455 subclass 277.2]  277.2           Subclass 277.2 indent level is 4 By signal quality (e.g., noise)
[List of Patents for class 455 subclass 278.1]  278.1           Subclass 278.1 indent level is 3 Combined with noise or interference elimination
[List of Patents for class 455 subclass 279.1]  279.1           Subclass 279.1 indent level is 4 Plural antenna currents entering single transformer
[List of Patents for class 455 subclass 280]  280           Subclass 280 indent level is 2 With coupling to a stage of the receiver
[List of Patents for class 455 subclass 281]  281           Subclass 281 indent level is 3 Having distributed parameters
[List of Patents for class 455 subclass 282]  282           Subclass 282 indent level is 4 Transmission line
[List of Patents for class 455 subclass 283]  283           Subclass 283 indent level is 3 Undesired signal or noise control (e.g., antistatic)
[List of Patents for class 455 subclass 284]  284           Subclass 284 indent level is 4 Balancing or cancelling
[List of Patents for class 455 subclass 285]  285           Subclass 285 indent level is 4 With image frequency suppression
[List of Patents for class 455 subclass 286]  286           Subclass 286 indent level is 4 Wave filter, coil, or wave trap
[List of Patents for class 455 subclass 287]  287           Subclass 287 indent level is 4 Shunt or bypass
[List of Patents for class 455 subclass 288]  288           Subclass 288 indent level is 4 Particular composition (e.g., of cell or element)
[List of Patents for class 455 subclass 289]  289           Subclass 289 indent level is 3 With coupling varying, regulating, or control
[List of Patents for class 455 subclass 290]  290           Subclass 290 indent level is 3 Including passive tuned circuit
[List of Patents for class 455 subclass 291]  291           Subclass 291 indent level is 3 Using active device (e.g., as preamplifier or reactance)
[List of Patents for class 455 subclass 292]  292           Subclass 292 indent level is 3 Transformer or other passive inductance
[List of Patents for class 455 subclass 293]  293           Subclass 293 indent level is 3 Specified stage (e.g., mixer, amplifier, or demodulator)
[List of Patents for class 455 subclass 294]  294           Subclass 294 indent level is 4 With particular electron tube structure
[List of Patents for class 455 subclass 295]  295           Subclass 295 indent level is 1 Modulation distortion or cross talk correction or elimination
[List of Patents for class 455 subclass 296]  296           Subclass 296 indent level is 1 Noise or interference elimination
[List of Patents for class 455 subclass 297]  297           Subclass 297 indent level is 2 In vehicle
[List of Patents for class 455 subclass 298]  298           Subclass 298 indent level is 2 Originating in power supply
[List of Patents for class 455 subclass 299]  299           Subclass 299 indent level is 3 Filter or rectification in power supply energized by fluctuating or a.c. source
[List of Patents for class 455 subclass 300]  300           Subclass 300 indent level is 2 By shielding
[List of Patents for class 455 subclass 301]  301           Subclass 301 indent level is 3 Plural or compartmented shielding structure
[List of Patents for class 455 subclass 302]  302           Subclass 302 indent level is 2 Image frequency suppression
[List of Patents for class 455 subclass 303]  303           Subclass 303 indent level is 2 Using plural separate signal paths
[List of Patents for class 455 subclass 304]  304           Subclass 304 indent level is 3 Phase shift in at least one path
[List of Patents for class 455 subclass 305]  305           Subclass 305 indent level is 3 With balancing or neutralizing
[List of Patents for class 455 subclass 306]  306           Subclass 306 indent level is 4 Filter in at least one path
[List of Patents for class 455 subclass 307]  307           Subclass 307 indent level is 2 With specific filter structure
[List of Patents for class 455 subclass 308]  308           Subclass 308 indent level is 2 With amplitude limiter
[List of Patents for class 455 subclass 309]  309           Subclass 309 indent level is 3 In demodulator or low frequency (audio amplifier circuit)
[List of Patents for class 455 subclass 310]  310           Subclass 310 indent level is 2 Internally generated noise or oscillations
[List of Patents for class 455 subclass 311]  311           Subclass 311 indent level is 2 In radio frequency amplifier, intermediate frequency amplifier or converter circuit
[List of Patents for class 455 subclass 312]  312           Subclass 312 indent level is 2 In demodulator or low frequency (e.g., audio frequency)
[List of Patents for class 455 subclass 313]  313           Subclass 313 indent level is 1 Frequency modifying or conversion
[List of Patents for class 455 subclass 314]  314           Subclass 314 indent level is 2 Plural separate successive conversions
[List of Patents for class 455 subclass 315]  315           Subclass 315 indent level is 3 With plural separate local oscillators
[List of Patents for class 455 subclass 316]  316           Subclass 316 indent level is 4 With frequency stabilization for at least one local oscillator
[List of Patents for class 455 subclass 317]  317           Subclass 317 indent level is 2 Unwanted oscillation or radiation prevention
[List of Patents for class 455 subclass 318]  318           Subclass 318 indent level is 2 With specified local oscillator structure or coupling
[List of Patents for class 455 subclass 319]  319           Subclass 319 indent level is 3 With particular coupling
[List of Patents for class 455 subclass 320]  320           Subclass 320 indent level is 4 Lumped impedance
[List of Patents for class 455 subclass 321]  321           Subclass 321 indent level is 3 In a single envelope or with common active element (e.g., autodyne)
[List of Patents for class 455 subclass 322]  322           Subclass 322 indent level is 4 Plural common electrode
[List of Patents for class 455 subclass 323]  323           Subclass 323 indent level is 2 Particular frequency conversion structure or circuitry
[List of Patents for class 455 subclass 324]  324           Subclass 324 indent level is 3 Homodyne (i.e., zero beat or synchrodyne reception)
[List of Patents for class 455 subclass 325]  325           Subclass 325 indent level is 3 Including distributed electrical parameter structure
[List of Patents for class 455 subclass 326]  326           Subclass 326 indent level is 4 With balanced mixer
[List of Patents for class 455 subclass 327]  327           Subclass 327 indent level is 5 Stripline
[List of Patents for class 455 subclass 328]  328           Subclass 328 indent level is 5 Hollow waveguide
[List of Patents for class 455 subclass 329]  329           Subclass 329 indent level is 4 Electron beam tube
[List of Patents for class 455 subclass 330]  330           Subclass 330 indent level is 4 With nonlinear impedance (e.g., diode)
[List of Patents for class 455 subclass 331]  331           Subclass 331 indent level is 3 Crystal or electron tube diode
[List of Patents for class 455 subclass 332]  332           Subclass 332 indent level is 3 Push-pull
[List of Patents for class 455 subclass 333]  333           Subclass 333 indent level is 3 Transistor or integrated circuit
[List of Patents for class 455 subclass 334]  334           Subclass 334 indent level is 1 With particular receiver circuit
[List of Patents for class 455 subclass 335]  335           Subclass 335 indent level is 2 Plural diverse function tube or stage (performs plural functions alternately or concurrently)
[List of Patents for class 455 subclass 336]  336           Subclass 336 indent level is 2 Superregenerative detector or discriminator
[List of Patents for class 455 subclass 337]  337           Subclass 337 indent level is 2 Discriminator or demodulator
[List of Patents for class 455 subclass 338]  338           Subclass 338 indent level is 2 Coupling or decoupling between stages
[List of Patents for class 455 subclass 339]  339           Subclass 339 indent level is 3 Band pass filter
[List of Patents for class 455 subclass 340]  340           Subclass 340 indent level is 3 Variably tunable or adjustable
[List of Patents for class 455 subclass 341]  341           Subclass 341 indent level is 2 Amplifier
[List of Patents for class 455 subclass 342]  342           Subclass 342 indent level is 3 Reflex type
[List of Patents for class 455 subclass 343.1]  343.1           Subclass 343.1 indent level is 2 Having particular power or bias supply (including self-powered or battery saving means)
[List of Patents for class 455 subclass 343.2]  343.2           Subclass 343.2 indent level is 3 Battery saving based on received signal
[List of Patents for class 455 subclass 343.3]  343.3           Subclass 343.3 indent level is 4 Based on identification
[List of Patents for class 455 subclass 343.4]  343.4           Subclass 343.4 indent level is 4 Based on schedule information
[List of Patents for class 455 subclass 343.5]  343.5           Subclass 343.5 indent level is 3 Battery saving based on detected power source level
[List of Patents for class 455 subclass 343.6]  343.6           Subclass 343.6 indent level is 3 Back-up power supply
[List of Patents for class 455 subclass 344]  344           Subclass 344 indent level is 1 Combined with diverse art device
[List of Patents for class 455 subclass 345]  345           Subclass 345 indent level is 2 With vehicle
[List of Patents for class 455 subclass 346]  346           Subclass 346 indent level is 3 Detachable for portability
[List of Patents for class 455 subclass 347]  347           Subclass 347 indent level is 1 Cabinet, housing, or chassis structure
[List of Patents for class 455 subclass 348]  348           Subclass 348 indent level is 2 With retractable or readily detachable chassis
[List of Patents for class 455 subclass 349]  349           Subclass 349 indent level is 2 Sectional or interconnectable (e.g., modules)
[List of Patents for class 455 subclass 350]  350           Subclass 350 indent level is 2 With particular speaker mounting
[List of Patents for class 455 subclass 351]  351           Subclass 351 indent level is 2 Transportable
[List of Patents for class 455 subclass 352]  352           Subclass 352 indent level is 1 Remote control of receiver
[List of Patents for class 455 subclass 353]  353           Subclass 353 indent level is 2 Plural conditions from remote station
[List of Patents for class 455 subclass 354]  354           Subclass 354 indent level is 3 Mechanical
[List of Patents for class 455 subclass 355]  355           Subclass 355 indent level is 2 Amplitude, volume, or gain control
[List of Patents for class 455 subclass 899]  899           MISCELLANEOUS
 
FOREIGN ART COLLECTIONS
 
   FOR000          CLASS-RELATED FOREIGN DOCUMENTS
Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived.
   FOR106          PLURAL TRANSMITTERS OR RECEIVERS (I.E., MORE THAN TWO STATIONS) (455/49.1)
   FOR107          Subclass FOR107 indent level is 1 Noise, distortion, or singing reduction (455/50.1)
   FOR108          Subclass FOR108 indent level is 2 Synchronized stations (455/51.1)
   FOR109          Subclass FOR109 indent level is 3 Simulcast system (455/51.2)
   FOR110          Subclass FOR110 indent level is 2 Fading compensation (455/52.1)
   FOR111          Subclass FOR111 indent level is 3 Due to weather attenuation (455/52.2)
   FOR112          Subclass FOR112 indent level is 3 Rayleigh or multipath fading (455/52.3)
   FOR113          Subclass FOR113 indent level is 1 With central station (e.g., master, etc.) (455/53.1)
   FOR114          Subclass FOR114 indent level is 2 To or from mobile station (455/54.1)
   FOR115          Subclass FOR115 indent level is 3 With service request and response (455/54.2)
   FOR116          Subclass FOR116 indent level is 3 Using radiating transmission line (455/55.1)
   FOR117          Subclass FOR117 indent level is 3 Multiple base stations (455/56.1)
   FOR118          Subclass FOR118 indent level is 2 Plural receivers tuned to common frequency (455/57.1)
   FOR119          Subclass FOR119 indent level is 1 Break-in or priority override (455/58.1)
   FOR120          Subclass FOR120 indent level is 1 Lockout or busy-idle signalling (455/58.2)
   FOR121          PORTABLE OR MOBILE TRANSCEIVER (455/89)
   FOR200          HAVING SINGLE CHANNEL TELEPHONE CARRIER (379/64)
   FOR201          Subclass FOR201 indent level is 1 Including call signalling (e.g., ringing, off-hook, dialing) (379/65)
   FOR202          Subclass FOR202 indent level is 1 Over power line (379/66)
   FOR203          EXCLUSIVE ASSIGNED CHANNEL (455/34.1)
   FOR204          SEIZED CHANNEL (455/34.2)
   FOR205          RADIO TELEPHONE SYSTEM OR EQUIPMENT DETAIL (379/58)
   FOR206          Subclass FOR206 indent level is 1 Zoned or cellular (379/59, 455/33.1)
   FOR207          Subclass FOR207 indent level is 2 Hand-off control (379/60, 455/33.2)
   FOR208          Subclass FOR208 indent level is 3 Using plural antennas (455/33.3)
   FOR209          Subclass FOR209 indent level is 2 Having overlapping zones (455/33.4)
   FOR210          Subclass FOR210 indent level is 1 Including cordless extension set (i.e., having single subscriber line access) (379/61)
   FOR211          Subclass FOR211 indent level is 2 Having privacy or lockout (e.g., identity verification) (379/62)
   FOR212          Subclass FOR212 indent level is 1 Including supervisory or control signalling (379/63)
   FOR213          AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING (455/2)
   FOR214          DISTRIBUTION SYSTEM (E.G., PLURAL CABLES, ETC.) (455/3.1)
   FOR215          Subclass FOR215 indent level is 1 Receiver for satellite broadcast (455/3.2)
   FOR216          Subclass FOR216 indent level is 1 Combined with power distribution network (455/3.3)
   FOR217          Subclass FOR217 indent level is 1 Remote control of distribution (455/4.1)
   FOR218          Subclass FOR218 indent level is 2 With subscriber selection or switching (455/4.2)
   FOR219          Subclass FOR219 indent level is 1 Two-way (455/5.1)
   FOR220          Subclass FOR220 indent level is 1 Common antenna or cable (455/6.1)
   FOR221          Subclass FOR221 indent level is 2 With specific cable converter (455/6.2)
   FOR222          Subclass FOR222 indent level is 1 Combined with diverse art device (e.g., audio/sound or entertainment systems) (455/6.3)
   FOR223          Subclass FOR223 indent level is 1 Near field (e.g., inductive or capacitive coupling) (455/41)
   FOR224          Subclass FOR224 indent level is 1 Distortion, noise, or other interference prevention, reduction, or compensation (455/63)
   FOR225          Subclass FOR225 indent level is 1 With diverse art device (455/66)
   FOR226          Subclass FOR226 indent level is 1 With measuring, testing, or monitoring of system or part (455/67.1)
   FOR227          Subclass FOR227 indent level is 2 Using a chamber (e.g., room testing or audio surveillance, etc.) (455/67.2)
   FOR228          Subclass FOR228 indent level is 2 Noise, distortion or unwanted signal detection (e.g., quality control, etc.) (455/67.3)
   FOR229          Subclass FOR229 indent level is 2 Using a test signal (455/67.4)
   FOR230          Subclass FOR230 indent level is 2 Of a microwave link or system (455/67.5)
   FOR231          Subclass FOR231 indent level is 2 Phase measuring (e.g., group delay propagation effects, etc.) (455/67.6)
   FOR232          Subclass FOR232 indent level is 1 Housing or support (455/90)
   FOR233          Subclass FOR233 indent level is 1 With harmonic radiation suppression (455/114)
   FOR234          Subclass FOR234 indent level is 1 Measuring, testing, or monitoring of transmitter (455/115)
   FOR235          Subclass FOR235 indent level is 1 Power or bias voltage supply (455/127)
   FOR236          Subclass FOR236 indent level is 2 With particular power or bias supply (includes battery saving means and includes self-powered) (455/343)
   FOR237          Subclass FOR237 indent level is 1 Emergency or alarm communication (455/404)
   FOR238          Subclass FOR238 indent level is 1 Message storage or retrieval (455/412)
   FOR239          Subclass FOR239 indent level is 1 Special service (455/414)
   FOR240          Subclass FOR240 indent level is 1 Zoned or cellular telephone system (455/422)
   FOR241          Subclass FOR241 indent level is 2 Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.) (455/426)
   FOR242          Subclass FOR242 indent level is 2 Roaming (455/432)
   FOR243          Subclass FOR243 indent level is 2 Registration (455/435)
   FOR244          Subclass FOR244 indent level is 3 Dynamic allocation (455/452)
   FOR245          Subclass FOR245 indent level is 2 Location monitoring (455/456)
   FOR246          Subclass FOR246 indent level is 1 Radiotelephone equipment detail (455/550)
   FOR247          Subclass FOR247 indent level is 2 Operable on more than one system (455/552)
   FOR248          Subclass FOR248 indent level is 3 Dual mode telephone (i.e., analog and digital) (455/553)
   FOR249          Subclass FOR249 indent level is 2 Remote private branch exchange (PBX) with wireless link to landline (455/554)
   FOR250          Subclass FOR250 indent level is 2 Integrated with other device (e.g., electronic notebook, personal digital assistant, etc.) (455/556)
   FOR251          Subclass FOR251 indent level is 3 Having specific antenna arrangement (455/562)
   FOR252          Subclass FOR252 indent level is 2 Headgear (455/568)
   FOR253          Subclass FOR253 indent level is 2 Hands-free or loudspeaking arrangement (455/569)
   FOR254          Subclass FOR254 indent level is 1 Portable or mobile (455/575)

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