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Class   380CRYPTOGRAPHY
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 [List of Pre Grant Publications for class 380 subclass 1][List of Patents for class 380 subclass 1]1 CRYPTANALYSIS
 [List of Pre Grant Publications for class 380 subclass 2][List of Patents for class 380 subclass 2]2 EQUIPMENT TEST OR MALFUNCTION INDICATION
[List of Pre Grant Publications for class 380 subclass 200][List of Patents for class 380 subclass 200]200 VIDEO CRYPTOGRAPHY
[List of Pre Grant Publications for class 380 subclass 201][List of Patents for class 380 subclass 201]201 Subclass 201 indent level is 1 Copy protection or prevention
 [List of Pre Grant Publications for class 380 subclass 202][List of Patents for class 380 subclass 202]202 Subclass 202 indent level is 2 Having origin or program ID
 [List of Pre Grant Publications for class 380 subclass 203][List of Patents for class 380 subclass 203]203 Subclass 203 indent level is 2 Having copy protect signal
 [List of Pre Grant Publications for class 380 subclass 204][List of Patents for class 380 subclass 204]204 Subclass 204 indent level is 2 Modifying sync signal
[List of Pre Grant Publications for class 380 subclass 205][List of Patents for class 380 subclass 205]205 Subclass 205 indent level is 1 Video electric signal masking
 [List of Pre Grant Publications for class 380 subclass 206][List of Patents for class 380 subclass 206]206 Subclass 206 indent level is 2 Masking of synchronization signal
 [List of Pre Grant Publications for class 380 subclass 207][List of Patents for class 380 subclass 207]207 Subclass 207 indent level is 2 Including locally generated masking signal
 [List of Pre Grant Publications for class 380 subclass 208][List of Patents for class 380 subclass 208]208 Subclass 208 indent level is 2 Including filter for removing masking signal
 [List of Pre Grant Publications for class 380 subclass 209][List of Patents for class 380 subclass 209]209 Subclass 209 indent level is 2 Masking signal selectively addressed
[List of Pre Grant Publications for class 380 subclass 210][List of Patents for class 380 subclass 210]210 Subclass 210 indent level is 1 Video electric signal modification (e.g., scrambling)
 [List of Pre Grant Publications for class 380 subclass 211][List of Patents for class 380 subclass 211]211 Subclass 211 indent level is 2 Interactive TV
 [List of Pre Grant Publications for class 380 subclass 212][List of Patents for class 380 subclass 212]212 Subclass 212 indent level is 2 Plural video stream multiplexing
 [List of Pre Grant Publications for class 380 subclass 213][List of Patents for class 380 subclass 213]213 Subclass 213 indent level is 2 Chrominance scrambling
[List of Pre Grant Publications for class 380 subclass 214][List of Patents for class 380 subclass 214]214 Subclass 214 indent level is 2 Nonstandard scan pattern of video information
[List of Pre Grant Publications for class 380 subclass 216][List of Patents for class 380 subclass 216]216 Subclass 216 indent level is 2 Image data converted to digital before modification
 [List of Pre Grant Publications for class 380 subclass 218][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 Pre Grant Publications for class 380 subclass 219][List of Patents for class 380 subclass 219]219 Subclass 219 indent level is 2 Carrier phase shift
 [List of Pre Grant Publications for class 380 subclass 220][List of Patents for class 380 subclass 220]220 Subclass 220 indent level is 2 Carrier frequency conversion
[List of Pre Grant Publications for class 380 subclass 221][List of Patents for class 380 subclass 221]221 Subclass 221 indent level is 2 By modifying synchronizing signal
[List of Pre Grant Publications for class 380 subclass 227][List of Patents for class 380 subclass 227]227 Subclass 227 indent level is 2 Record or coin controlled
[List of Pre Grant Publications for class 380 subclass 231][List of Patents for class 380 subclass 231]231 Subclass 231 indent level is 2 Usage or charge determination
 [List of Pre Grant Publications for class 380 subclass 235][List of Patents for class 380 subclass 235]235 Subclass 235 indent level is 2 Phase inversion of scan line information
[List of Pre Grant Publications for class 380 subclass 236][List of Patents for class 380 subclass 236]236 Subclass 236 indent level is 2 Modifying accompanying audio signal
 [List of Pre Grant Publications for class 380 subclass 239][List of Patents for class 380 subclass 239]239 Subclass 239 indent level is 2 Encrypted code control signal
[List of Pre Grant Publications for class 380 subclass 240][List of Patents for class 380 subclass 240]240 Subclass 240 indent level is 2 Including addressed decoder control signal
[List of Pre Grant Publications for class 380 subclass 243][List of Patents for class 380 subclass 243]243 FACSIMILE CRYPTOGRAPHY
 [List of Pre Grant Publications for class 380 subclass 244][List of Patents for class 380 subclass 244]244 Subclass 244 indent level is 1 Synchronization
 [List of Pre Grant Publications for class 380 subclass 245][List of Patents for class 380 subclass 245]245 Subclass 245 indent level is 1 Nonstandard scan pattern
 [List of Pre Grant Publications for class 380 subclass 246][List of Patents for class 380 subclass 246]246 Subclass 246 indent level is 1 Including generation of an associated coded record
[List of Pre Grant Publications for class 380 subclass 247][List of Patents for class 380 subclass 247]247 CELLULAR TELEPHONE CRYPTOGRAPHIC AUTHENTICATION
 [List of Pre Grant Publications for class 380 subclass 248][List of Patents for class 380 subclass 248]248 Subclass 248 indent level is 1 Visiting center
 [List of Pre Grant Publications for class 380 subclass 249][List of Patents for class 380 subclass 249]249 Subclass 249 indent level is 1 Initialization
 [List of Pre Grant Publications for class 380 subclass 250][List of Patents for class 380 subclass 250]250 Subclass 250 indent level is 1 Usage pattern detection
 [List of Pre Grant Publications for class 380 subclass 251][List of Patents for class 380 subclass 251]251 ELECTRONIC GAME USING CRYPTOGRAPHY
[List of Pre Grant Publications for class 380 subclass 252][List of Patents for class 380 subclass 252]252 ELECTRIC SIGNAL MASKING
 [List of Pre Grant Publications for class 380 subclass 253][List of Patents for class 380 subclass 253]253 Subclass 253 indent level is 1 By signal having discrete frequency component
 [List of Pre Grant Publications for class 380 subclass 254][List of Patents for class 380 subclass 254]254 Subclass 254 indent level is 1 By signal having discrete step amplitude variation
[List of Pre Grant Publications for class 380 subclass 255][List of Patents for class 380 subclass 255]255 COMMUNICATION SYSTEM USING CRYPTOGRAPHY
 [List of Pre Grant Publications for class 380 subclass 256][List of Patents for class 380 subclass 256]256 Subclass 256 indent level is 1 Fiber optic network
[List of Pre Grant Publications for class 380 subclass 257][List of Patents for class 380 subclass 257]257 Subclass 257 indent level is 1 Circuit switched network (e.g., wired telephone)
 [List of Pre Grant Publications for class 380 subclass 41][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 Pre Grant Publications for class 380 subclass 258][List of Patents for class 380 subclass 258]258 Subclass 258 indent level is 1 Position dependent or authenticating
[List of Pre Grant Publications for class 380 subclass 259][List of Patents for class 380 subclass 259]259 Subclass 259 indent level is 1 Symmetric key cryptography
[List of Pre Grant Publications for class 380 subclass 260][List of Patents for class 380 subclass 260]260 Subclass 260 indent level is 2 Symmetric key synchronization
 [List of Pre Grant Publications for class 380 subclass 264][List of Patents for class 380 subclass 264]264 Subclass 264 indent level is 2 Key derived from addressable memory element
 [List of Pre Grant Publications for class 380 subclass 265][List of Patents for class 380 subclass 265]265 Subclass 265 indent level is 2 Combining outputs of shift register
 [List of Pre Grant Publications for class 380 subclass 266][List of Patents for class 380 subclass 266]266 Subclass 266 indent level is 2 Including a modem
 [List of Pre Grant Publications for class 380 subclass 267][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 Pre Grant Publications for class 380 subclass 268][List of Patents for class 380 subclass 268]268 Subclass 268 indent level is 1 Pseudo-random sequence scrambling
 [List of Pre Grant Publications for class 380 subclass 269][List of Patents for class 380 subclass 269]269 Subclass 269 indent level is 1 Having compression
[List of Pre Grant Publications for class 380 subclass 270][List of Patents for class 380 subclass 270]270 Subclass 270 indent level is 1 Wireless communication
 [List of Pre Grant Publications for class 380 subclass 271][List of Patents for class 380 subclass 271]271 Subclass 271 indent level is 2 Having receiver selection (e.g., pager)
 [List of Pre Grant Publications for class 380 subclass 272][List of Patents for class 380 subclass 272]272 Subclass 272 indent level is 2 Including hand-off based cryptographic alteration
 [List of Pre Grant Publications for class 380 subclass 273][List of Patents for class 380 subclass 273]273 Subclass 273 indent level is 2 Rekeying system
[List of Pre Grant Publications for class 380 subclass 31][List of Patents for class 380 subclass 31]31 Subclass 31 indent level is 2 Plural modulation of single carrier
[List of Pre Grant Publications for class 380 subclass 33][List of Patents for class 380 subclass 33]33 Subclass 33 indent level is 2 Using plural paths or channels
 [List of Pre Grant Publications for class 380 subclass 274][List of Patents for class 380 subclass 274]274 Subclass 274 indent level is 2 Synchronization
 [List of Pre Grant Publications for class 380 subclass 35][List of Patents for class 380 subclass 35]35 Subclass 35 indent level is 1 Variable time delay modulation
[List of Pre Grant Publications for class 380 subclass 36][List of Patents for class 380 subclass 36]36 Subclass 36 indent level is 1 Time segment interchange
 [List of Pre Grant Publications for class 380 subclass 37][List of Patents for class 380 subclass 37]37 Subclass 37 indent level is 2 Block/data stream enciphering
[List of Pre Grant Publications for class 380 subclass 38][List of Patents for class 380 subclass 38]38 Subclass 38 indent level is 1 Frequency shift or inversion
 [List of Pre Grant Publications for class 380 subclass 39][List of Patents for class 380 subclass 39]39 Subclass 39 indent level is 2 Having plural band pass filters
 [List of Pre Grant Publications for class 380 subclass 40][List of Patents for class 380 subclass 40]40 Subclass 40 indent level is 1 Having plural band pass filters
[List of Pre Grant Publications for class 380 subclass 42][List of Patents for class 380 subclass 42]42 Subclass 42 indent level is 1 Data stream/substitution enciphering
 [List of Pre Grant Publications for class 380 subclass 43][List of Patents for class 380 subclass 43]43 Subclass 43 indent level is 2 Key sequence signal combined with data signal
[List of Pre Grant Publications for class 380 subclass 275][List of Patents for class 380 subclass 275]275 Subclass 275 indent level is 1 Speech scrambler detail
 [List of Pre Grant Publications for class 380 subclass 276][List of Patents for class 380 subclass 276]276 Subclass 276 indent level is 2 Including sampling
[List of Pre Grant Publications for class 380 subclass 277][List of Patents for class 380 subclass 277]277 KEY MANAGEMENT
[List of Pre Grant Publications for class 380 subclass 278][List of Patents for class 380 subclass 278]278 Subclass 278 indent level is 1 Key distribution
[List of Pre Grant Publications for class 380 subclass 279][List of Patents for class 380 subclass 279]279 Subclass 279 indent level is 2 Key distribution center
[List of Pre Grant Publications for class 380 subclass 283][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 Pre Grant Publications for class 380 subclass 286][List of Patents for class 380 subclass 286]286 Subclass 286 indent level is 1 Key escrow or recovery
[List of Pre Grant Publications for class 380 subclass 44][List of Patents for class 380 subclass 44]44 Subclass 44 indent level is 1 Having particular key generator
 [List of Pre Grant Publications for class 380 subclass 45][List of Patents for class 380 subclass 45]45 Subclass 45 indent level is 2 Multiple key level
 [List of Pre Grant Publications for class 380 subclass 46][List of Patents for class 380 subclass 46]46 Subclass 46 indent level is 2 Nonlinear (e.g., pseudorandom)
 [List of Pre Grant Publications for class 380 subclass 47][List of Patents for class 380 subclass 47]47 Subclass 47 indent level is 2 Plural generators
[List of Pre Grant Publications for class 380 subclass 28][List of Patents for class 380 subclass 28]28 PARTICULAR ALGORITHMIC FUNCTION ENCODING
 [List of Pre Grant Publications for class 380 subclass 29][List of Patents for class 380 subclass 29]29 Subclass 29 indent level is 1 NBS/DES algorithm
 [List of Pre Grant Publications for class 380 subclass 30][List of Patents for class 380 subclass 30]30 Subclass 30 indent level is 1 Public key
[List of Pre Grant Publications for class 380 subclass 287][List of Patents for class 380 subclass 287]287 ELECTRIC SIGNAL MODIFICATION
 [List of Pre Grant Publications for class 380 subclass 22][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 Pre Grant Publications for class 380 subclass 26][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 Pre Grant Publications for class 380 subclass 27][List of Patents for class 380 subclass 27]27 Subclass 27 indent level is 2 By perforated record
 [List of Pre Grant Publications for class 380 subclass 51][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 Pre Grant Publications for class 380 subclass 52][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 Pre Grant Publications for class 380 subclass 53][List of Patents for class 380 subclass 53]53 Subclass 53 indent level is 2 Audio transducer mounting or structure
 [List of Pre Grant Publications for class 380 subclass 54][List of Patents for class 380 subclass 54]54 BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY)
 [List of Pre Grant Publications for class 380 subclass 55][List of Patents for class 380 subclass 55]55 HAVING PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR TYPEWRITER)
[List of Pre Grant Publications for class 380 subclass 56][List of Patents for class 380 subclass 56]56 SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS
[List of Pre Grant Publications for class 380 subclass 57][List of Patents for class 380 subclass 57]57 Subclass 57 indent level is 1 Rotatable
 [List of Pre Grant Publications for class 380 subclass 58][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 Pre Grant Publications for class 380 subclass 59][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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