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Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 380 | CRYPTOGRAPHY |
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1 | CRYPTANALYSIS |
2 | EQUIPMENT TEST OR MALFUNCTION INDICATION |
200 | VIDEO CRYPTOGRAPHY |
201 | Copy protection or prevention |
205 | Video electric signal masking |
206 | Masking of synchronization signal |
207 | Including locally generated masking signal |
208 | Including filter for removing masking signal |
209 | Masking signal selectively addressed |
210 | Video electric signal modification (e.g., scrambling) |
211 | Interactive TV |
212 | Plural video stream multiplexing |
213 | Chrominance scrambling |
214 | Nonstandard scan pattern of video information |
216 | Image data converted to digital before modification |
218 | Variable time delay modulation of baseband video signal |
219 | Carrier phase shift |
220 | Carrier frequency conversion |
221 | By modifying synchronizing signal |
222 | Including phase inversion of scan line information |
223 | Key signal on separate carrier |
224 | Including pseudo-synchronizing pulse |
225 | Self-synchronizing circuit at receiver |
226 | Key signal in blanking interval |
227 | Record or coin controlled |
231 | Usage or charge determination |
232 | Including authentication |
233 | Including usage or charge recording at subscriber station |
234 | Including display of supplemental information |
235 | Phase inversion of scan line information |
236 | Modifying accompanying audio signal |
237 | Including digital audio |
238 | Including frequency modification of audio signal or frequency shifting of audio carrier |
239 | Encrypted code control signal |
240 | Including addressed decoder control signal |
243 | FACSIMILE CRYPTOGRAPHY |
244 | Synchronization |
245 | Nonstandard scan pattern |
246 | Including generation of an associated coded record |
247 | CELLULAR TELEPHONE CRYPTOGRAPHIC AUTHENTICATION |
251 | ELECTRONIC GAME USING CRYPTOGRAPHY |
252 | ELECTRIC SIGNAL MASKING |
253 | By signal having discrete frequency component |
254 | By signal having discrete step amplitude variation |
255 | COMMUNICATION SYSTEM USING CRYPTOGRAPHY |
256 | Fiber optic network |
257 | Circuit switched network (e.g., wired telephone) |
258 | Position dependent or authenticating |
259 | Symmetric key cryptography |
260 | Symmetric key synchronization |
261 | Including frame synchronization |
262 | Transmitting a seed, sequence, or initial value |
263 | Nonlinear or chaotic system |
264 | Key derived from addressable memory element |
265 | Combining outputs of shift register |
266 | Including a modem |
267 | Correcting for random appearance of control character code |
268 | Pseudo-random sequence scrambling |
269 | Having compression |
270 | Wireless communication |
271 | Having receiver selection (e.g., pager) |
272 | Including hand-off based cryptographic alteration |
273 | Rekeying system |
31 | Plural modulation of single carrier |
33 | Using plural paths or channels |
274 | Synchronization |
35 | Variable time delay modulation |
36 | Time segment interchange |
38 | Frequency shift or inversion |
40 | Having plural band pass filters |
42 | Data stream/substitution enciphering |
275 | Speech scrambler detail |
277 | KEY MANAGEMENT |
278 | Key distribution |
286 | Key escrow or recovery |
44 | Having particular key generator |
28 | PARTICULAR ALGORITHMIC FUNCTION ENCODING |
287 | ELECTRIC SIGNAL MODIFICATION |
22 | Having magnetic record carrier (e.g., tape, drum) |
26 | Having mechanical control of signal encryption (e.g., cam) |
51 | Having production of printed copy (e.g., printer, typewriter) |
52 | Including particular structure or housing (e.g., display, keyboard) |
54 | BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY) |
55 | HAVING PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR TYPEWRITER) |
56 | SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS |
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 | Digital data (e.g., software program protection, data encryption) (380/4) |
FOR105 | Video (380/5) |
FOR106 | ELECTRIC SIGNAL MASKING (380/6) |
FOR109 | ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING) (380/9) |
FOR110 | Video (380/10) |
FOR111 | Variable time delay modulation of baseband video signal (380/11) |
FOR112 | Carrier phase shift (380/12) |
FOR113 | Carrier frequency conversion (380/13) |
FOR114 | Nonstandard scan of video information (380/14) |
FOR115 | By modifying synchronizing signal (380/15) |
FOR116 | Record or coin controlled (380/16) |
FOR117 | Phase inversion of scan line information (380/17) |
FOR118 | Facsimile (380/18) |
FOR119 | Encrypting of accompanying audio signal (380/19) |
FOR120 | Control coding (380/20) |
FOR121 | Having transmission or distribution of key signal (380/21) |
FOR148 | Having particular synchronization or initiation (380/48) |
FOR149 | Having digital signal handling (e.g., digital control, digital computer communication) (380/49) |
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