What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.
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363-131 121-55A 14-.5
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Class Number: 380
Class Title: CRYPTOGRAPHY
Subclass Subclass
Number Title
1 CRYPTANALYSIS
2 EQUIPMENT TEST OR MALFUNCTION INDICATION
3 STORED INFORMATION ACCESS OR COPY PREVENTION
4 .Digital data (e.g., software program protection, data
encryption)
5 .Video
6 ELECTRIC SIGNAL MASKING
7 .Video
8 .By signal having discrete step amplitude variation
9 ELECTRIC SIGNAL MODIFICATION (E.G., SCRAMBLING)
10 .Video
11 ..Variable time delay modulation of baseband video signal
12 ..Carrier phase shift
13 ..Carrier frequency conversion
14 ..Nonstandard scan of video information
15 ..By modifying synchronizing signal
16 ..Record or coin controlled
17 ..Phase inversion of scan line information
18 ..Facsimile
19 ..Encrypting of accompanying audio signal
20 ..Control coding
21 .Having transmission or distribution of key signal
22 .With magnetic record carrier (e.g., tape, drum)
23 .With user or record actuated authentication
24 ..Electronic funds transfer (e.g., automatic teller)
25 ..Computer
26 .With mechanical control of signal encryption (e.g., cam)
27 ..By perforated record
28 .By particular algorithmic function encoding
29 ..NBS/DES algorithm
30 ..Public key
31 .Plural modulation of single carrier
32 ..Wobbling of carrier
33 .Using plural paths or channels
34 ..Plural carrier frequencies
35 .Variable time delay modulation
36 .Time segment interchange
37 ..Block/data stream enciphering
38 .Frequency shift or inversion
39 ..With plural band pass filters
40 .With plural band pass filters
41 .With quantizing and subsequent normalizing of signal (e.g.,
reentry telephone circuitry)
42 .Data stream/substitution enciphering
43 ..Key sequence signal combined with data signal
44 ..With particular key generator
45 ...Multiple key level
46 ...Nonlinear (e.g., pseudorandom)
47 ...Plural generators
48 .With particular synchronization or initiation
49 .With digital signal handling (e.g., digital control, digital
computer communication))
50 ..Including shift register or memory
51 .With production of printed copy (e.g., printer, typewriter)
52 .Including particular structure or housing (e.g., display,
keyboard)
53 ..Audio transducer mounting or structure
54 BY MODIFYING OPTICAL IMAGE (E.G., TRANSMISSIVE OVERLAY)
55 WITH PRODUCTION OF PRINTED COPY (E.G., CRYPTOGRAPHIC PRINTER OR
TYPEWRITER)
56 SELECTIVELY MOVABLE ELEMENT HAVING CODE CHARACTERS
57 .Rotatable
58 ..Characters on peripheral surface (e.g., cylinder section)
59 MISCELLANEOUS