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[Search a list of Patent Appplications for class 380]  Class   380CRYPTOGRAPHY
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[List of Patents for class 380 subclass 1]  1           CRYPTANALYSIS
[List of Patents for class 380 subclass 2]  2           EQUIPMENT TEST OR MALFUNCTION INDICATION
[List of Patents for class 380 subclass 200]  200           VIDEO CRYPTOGRAPHY
[List of Patents for class 380 subclass 201]  201           Subclass 201 indent level is 1 Copy protection or prevention
[List of Patents for class 380 subclass 202]  202           Subclass 202 indent level is 2 Having origin or program ID
[List of Patents for class 380 subclass 203]  203           Subclass 203 indent level is 2 Having copy protect signal
[List of Patents for class 380 subclass 204]  204           Subclass 204 indent level is 2 Modifying sync signal
[List of Patents for class 380 subclass 205]  205           Subclass 205 indent level is 1 Video electric signal masking
[List of Patents for class 380 subclass 206]  206           Subclass 206 indent level is 2 Masking of synchronization signal
[List of Patents for class 380 subclass 207]  207           Subclass 207 indent level is 2 Including locally generated masking signal
[List of Patents for class 380 subclass 208]  208           Subclass 208 indent level is 2 Including filter for removing masking signal
[List of Patents for class 380 subclass 209]  209           Subclass 209 indent level is 2 Masking signal selectively addressed
[List of Patents for class 380 subclass 210]  210           Subclass 210 indent level is 1 Video electric signal modification (e.g., scrambling)
[List of Patents for class 380 subclass 211]  211           Subclass 211 indent level is 2 Interactive TV
[List of Patents for class 380 subclass 212]  212           Subclass 212 indent level is 2 Plural video stream multiplexing
[List of Patents for class 380 subclass 213]  213           Subclass 213 indent level is 2 Chrominance scrambling
[List of Patents for class 380 subclass 214]  214           Subclass 214 indent level is 2 Nonstandard scan pattern of video information
[List of Patents for class 380 subclass 215]  215           Subclass 215 indent level is 3 Line cut and shuffle
[List of Patents for class 380 subclass 216]  216           Subclass 216 indent level is 2 Image data converted to digital before modification
[List of Patents for class 380 subclass 217]  217           Subclass 217 indent level is 3 Having compression (e.g., MPEG)
[List of Patents for class 380 subclass 218]  218           Subclass 218 indent level is 2 Variable time delay modulation of baseband video signal
[List of Patents for class 380 subclass 219]  219           Subclass 219 indent level is 2 Carrier phase shift
[List of Patents for class 380 subclass 220]  220           Subclass 220 indent level is 2 Carrier frequency conversion
[List of Patents for class 380 subclass 221]  221           Subclass 221 indent level is 2 By modifying synchronizing signal
[List of Patents for class 380 subclass 222]  222           Subclass 222 indent level is 3 Including phase inversion of scan line information
[List of Patents for class 380 subclass 223]  223           Subclass 223 indent level is 3 Key signal on separate carrier
[List of Patents for class 380 subclass 224]  224           Subclass 224 indent level is 3 Including pseudo-synchronizing pulse
[List of Patents for class 380 subclass 225]  225           Subclass 225 indent level is 3 Self-synchronizing circuit at receiver
[List of Patents for class 380 subclass 226]  226           Subclass 226 indent level is 3 Key signal in blanking interval
[List of Patents for class 380 subclass 227]  227           Subclass 227 indent level is 2 Record or coin controlled
[List of Patents for class 380 subclass 228]  228           Subclass 228 indent level is 3 Including key on record
[List of Patents for class 380 subclass 229]  229           Subclass 229 indent level is 3 Including authentication
[List of Patents for class 380 subclass 230]  230           Subclass 230 indent level is 3 Including usage recording
[List of Patents for class 380 subclass 231]  231           Subclass 231 indent level is 2 Usage or charge determination
[List of Patents for class 380 subclass 232]  232           Subclass 232 indent level is 3 Including authentication
[List of Patents for class 380 subclass 233]  233           Subclass 233 indent level is 3 Including usage or charge recording at subscriber station
[List of Patents for class 380 subclass 234]  234           Subclass 234 indent level is 3 Including display of supplemental information
[List of Patents for class 380 subclass 235]  235           Subclass 235 indent level is 2 Phase inversion of scan line information
[List of Patents for class 380 subclass 236]  236           Subclass 236 indent level is 2 Modifying accompanying audio signal
[List of Patents for class 380 subclass 237]  237           Subclass 237 indent level is 3 Including digital audio
[List of Patents for class 380 subclass 238]  238           Subclass 238 indent level is 3 Including frequency modification of audio signal or frequency shifting of audio carrier
[List of Patents for class 380 subclass 239]  239           Subclass 239 indent level is 2 Encrypted code control signal
[List of Patents for class 380 subclass 240]  240           Subclass 240 indent level is 2 Including addressed decoder control signal
[List of Patents for class 380 subclass 241]  241           Subclass 241 indent level is 3 Having program ID or authorization
[List of Patents for class 380 subclass 242]  242           Subclass 242 indent level is 3 Having command signal for receiver
[List of Patents for class 380 subclass 243]  243           FACSIMILE CRYPTOGRAPHY
[List of Patents for class 380 subclass 244]  244           Subclass 244 indent level is 1 Synchronization
[List of Patents for class 380 subclass 245]  245           Subclass 245 indent level is 1 Nonstandard scan pattern
[List of Patents for class 380 subclass 246]  246           Subclass 246 indent level is 1 Including generation of an associated coded record
[List of Patents for class 380 subclass 247]  247           CELLULAR TELEPHONE CRYPTOGRAPHIC AUTHENTICATION
[List of Patents for class 380 subclass 248]  248           Subclass 248 indent level is 1 Visiting center
[List of Patents for class 380 subclass 249]  249           Subclass 249 indent level is 1 Initialization
[List of Patents for class 380 subclass 250]  250           Subclass 250 indent level is 1 Usage pattern detection
[List of Patents for class 380 subclass 251]  251           ELECTRONIC GAME USING CRYPTOGRAPHY
[List of Patents for class 380 subclass 252]  252           ELECTRIC SIGNAL MASKING
[List of Patents for class 380 subclass 253]  253           Subclass 253 indent level is 1 By signal having discrete frequency component
[List of Patents for class 380 subclass 254]  254           Subclass 254 indent level is 1 By signal having discrete step amplitude variation
[List of Patents for class 380 subclass 255]  255           COMMUNICATION SYSTEM USING CRYPTOGRAPHY
[List of Patents for class 380 subclass 256]  256           Subclass 256 indent level is 1 Fiber optic network
[List of Patents for class 380 subclass 257]  257           Subclass 257 indent level is 1 Circuit switched network (e.g., wired telephone)
[List of Patents for class 380 subclass 41]  41           Subclass 41 indent level is 2 Having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry)
[List of Patents for class 380 subclass 258]  258           Subclass 258 indent level is 1 Position dependent or authenticating
[List of Patents for class 380 subclass 259]  259           Subclass 259 indent level is 1 Symmetric key cryptography
[List of Patents for class 380 subclass 260]  260           Subclass 260 indent level is 2 Symmetric key synchronization
[List of Patents for class 380 subclass 261]  261           Subclass 261 indent level is 3 Including frame synchronization
[List of Patents for class 380 subclass 262]  262           Subclass 262 indent level is 3 Transmitting a seed, sequence, or initial value
[List of Patents for class 380 subclass 263]  263           Subclass 263 indent level is 3 Nonlinear or chaotic system
[List of Patents for class 380 subclass 264]  264           Subclass 264 indent level is 2 Key derived from addressable memory element
[List of Patents for class 380 subclass 265]  265           Subclass 265 indent level is 2 Combining outputs of shift register
[List of Patents for class 380 subclass 266]  266           Subclass 266 indent level is 2 Including a modem
[List of Patents for class 380 subclass 267]  267           Subclass 267 indent level is 1 Correcting for random appearance of control character code
[List of Patents for class 380 subclass 268]  268           Subclass 268 indent level is 1 Pseudo-random sequence scrambling
[List of Patents for class 380 subclass 269]  269           Subclass 269 indent level is 1 Having compression
[List of Patents for class 380 subclass 270]  270           Subclass 270 indent level is 1 Wireless communication
[List of Patents for class 380 subclass 271]  271           Subclass 271 indent level is 2 Having receiver selection (e.g., pager)
[List of Patents for class 380 subclass 272]  272           Subclass 272 indent level is 2 Including hand-off based cryptographic alteration
[List of Patents for class 380 subclass 273]  273           Subclass 273 indent level is 2 Rekeying system
[List of Patents for class 380 subclass 31]  31           Subclass 31 indent level is 2 Plural modulation of single carrier
[List of Patents for class 380 subclass 32]  32           Subclass 32 indent level is 3 Wobbling of carrier
[List of Patents for class 380 subclass 33]  33           Subclass 33 indent level is 2 Using plural paths or channels
[List of Patents for class 380 subclass 34]  34           Subclass 34 indent level is 3 Plural carrier frequencies
[List of Patents for class 380 subclass 274]  274           Subclass 274 indent level is 2 Synchronization
[List of Patents for class 380 subclass 35]  35           Subclass 35 indent level is 1 Variable time delay modulation
[List of Patents for class 380 subclass 36]  36           Subclass 36 indent level is 1 Time segment interchange
[List of Patents for class 380 subclass 37]  37           Subclass 37 indent level is 2 Block/data stream enciphering
[List of Patents for class 380 subclass 38]  38           Subclass 38 indent level is 1 Frequency shift or inversion
[List of Patents for class 380 subclass 39]  39           Subclass 39 indent level is 2 Having plural band pass filters
[List of Patents for class 380 subclass 40]  40           Subclass 40 indent level is 1 Having plural band pass filters
[List of Patents for class 380 subclass 42]  42           Subclass 42 indent level is 1 Data stream/substitution enciphering
[List of Patents for class 380 subclass 43]  43           Subclass 43 indent level is 2 Key sequence signal combined with data signal
[List of Patents for class 380 subclass 275]  275           Subclass 275 indent level is 1 Speech scrambler detail
[List of Patents for class 380 subclass 276]  276           Subclass 276 indent level is 2 Including sampling
[List of Patents for class 380 subclass 277]  277           KEY MANAGEMENT
[List of Patents for class 380 subclass 278]  278           Subclass 278 indent level is 1 Key distribution
[List of Patents for class 380 subclass 279]  279           Subclass 279 indent level is 2 Key distribution center
[List of Patents for class 380 subclass 280]  280           Subclass 280 indent level is 3 Control vector or tag
[List of Patents for class 380 subclass 281]  281           Subclass 281 indent level is 3 Using master key (e.g., key-encrypting-key)
[List of Patents for class 380 subclass 282]  282           Subclass 282 indent level is 3 By public key method
[List of Patents for class 380 subclass 283]  283           Subclass 283 indent level is 2 User-to-user key distributed over data link (i.e., no center)
[List of Patents for class 380 subclass 284]  284           Subclass 284 indent level is 3 Using master key (e.g., key-encrypting-key)
[List of Patents for class 380 subclass 285]  285           Subclass 285 indent level is 3 By public key method
[List of Patents for class 380 subclass 286]  286           Subclass 286 indent level is 1 Key escrow or recovery
[List of Patents for class 380 subclass 44]  44           Subclass 44 indent level is 1 Having particular key generator
[List of Patents for class 380 subclass 45]  45           Subclass 45 indent level is 2 Multiple key level
[List of Patents for class 380 subclass 46]  46           Subclass 46 indent level is 2 Nonlinear (e.g., pseudorandom)
[List of Patents for class 380 subclass 47]  47           Subclass 47 indent level is 2 Plural generators
[List of Patents for class 380 subclass 28]  28           PARTICULAR ALGORITHMIC FUNCTION ENCODING
[List of Patents for class 380 subclass 29]  29           Subclass 29 indent level is 1 NBS/DES algorithm
[List of Patents for class 380 subclass 30]  30           Subclass 30 indent level is 1 Public key
[List of Patents for class 380 subclass 287]  287           ELECTRIC SIGNAL MODIFICATION
[List of Patents for class 380 subclass 22]  22           Subclass 22 indent level is 1 Having magnetic record carrier (e.g., tape, drum)
[List of Patents for class 380 subclass 26]  26           Subclass 26 indent level is 1 Having mechanical control of signal encryption (e.g., cam)
[List of Patents for class 380 subclass 27]  27           Subclass 27 indent level is 2 By perforated record
[List of Patents for class 380 subclass 51]  51           Subclass 51 indent level is 1 Having production of printed copy (e.g., printer, typewriter)
[List of Patents for class 380 subclass 52]  52           Subclass 52 indent level is 1 Including particular structure or housing (e.g., display, keyboard)
[List of Patents for class 380 subclass 53]  53           Subclass 53 indent level is 2 Audio transducer mounting or structure
[List of Patents for class 380 subclass 54]  54           BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY)
[List of Patents for class 380 subclass 55]  55           HAVING PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR TYPEWRITER)
[List of Patents for class 380 subclass 56]  56           SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS
[List of Patents for class 380 subclass 57]  57           Subclass 57 indent level is 1 Rotatable
[List of Patents for class 380 subclass 58]  58           Subclass 58 indent level is 2 Characters on peripheral surface (e.g., cylinder section)
[List of Patents for class 380 subclass 59]  59           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.
   FOR103          STORED INFORMATION ACCESS OR COPY PREVENTION (380/3)
   FOR104          Subclass FOR104 indent level is 1 Digital data (e.g., software program protection, data encryption) (380/4)
   FOR105          Subclass FOR105 indent level is 1 Video (380/5)
   FOR106          ELECTRIC SIGNAL MASKING (380/6)
   FOR107          Subclass FOR107 indent level is 1 Video (380/7)
   FOR108          Subclass FOR108 indent level is 1 By signal having discrete step amplitude variation (380/8)
   FOR109          ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) (380/9)
   FOR110          Subclass FOR110 indent level is 1 Video (380/10)
   FOR111          Subclass FOR111 indent level is 2 Variable time delay modulation of baseband video signal (380/11)
   FOR112          Subclass FOR112 indent level is 2 Carrier phase shift (380/12)
   FOR113          Subclass FOR113 indent level is 2 Carrier frequency conversion (380/13)
   FOR114          Subclass FOR114 indent level is 2 Nonstandard scan of video information (380/14)
   FOR115          Subclass FOR115 indent level is 2 By modifying synchronizing signal (380/15)
   FOR116          Subclass FOR116 indent level is 2 Record or coin controlled (380/16)
   FOR117          Subclass FOR117 indent level is 2 Phase inversion of scan line information (380/17)
   FOR118          Subclass FOR118 indent level is 2 Facsimile (380/18)
   FOR119          Subclass FOR119 indent level is 2 Encrypting of accompanying audio signal (380/19)
   FOR120          Subclass FOR120 indent level is 2 Control coding (380/20)
   FOR121          Subclass FOR121 indent level is 1 Having transmission or distribution of key signal (380/21)
   FOR148          Subclass FOR148 indent level is 1 Having particular synchronization or initiation (380/48)
   FOR149          Subclass FOR149 indent level is 1 Having digital signal handling (e.g., digital control, digital computer communication) (380/49)
   FOR150          Subclass FOR150 indent level is 2 Including shift register or memory (380/50)

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