Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Information Technology
Class Information
Number: 380
Name: Cryptography >
Description: SUBJECT MATTER UNDER THIS CLASS:


Class Number Class Name No. of Patents
380/54

By modifying optical image (e.g., transmissive overlay)

360
380/247

Cellular telephone cryptographic authentication

276
380/249

Initialization

60
380/250

Usage pattern detection

41
380/248

Visiting center

55
380/255

Communication system using cryptography

322
380/257

Circuit switched network (e.g., wired telephone)

103
380/41

Having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry)

40
380/267

Correcting for random appearance of control character code

25
380/42

Data stream/substitution enciphering

248
380/43

Key sequence signal combined with data signal

282
380/256

Fiber optic network

97
380/38

Frequency shift or inversion

64
380/39

Having plural band pass filters

30
380/269

Having compression

110
380/40

Having plural band pass filters

28
380/258

Position dependent or authenticating

127
380/268

Pseudo-random sequence scrambling

223
380/275

Speech scrambler detail

76
380/276

Including sampling

52
380/259

Symmetric key cryptography

206
380/265

Combining outputs of shift register

90
380/266

Including a modem

63
380/264

Key derived from addressable memory element

89
380/260

Symmetric key synchronization

131
380/261

Including frame synchronization

94
380/263

Nonlinear or chaotic system

81
380/262

Transmitting a seed, sequence, or initial value

261
380/36

Time segment interchange

67
380/37

Block/data stream enciphering

366
380/35

Variable time delay modulation

51
380/270

Wireless communication

458
380/271

Having receiver selection (e.g., pager)

71
380/272

Including hand-off based cryptographic alteration

40
380/31

Plural modulation of single carrier

40
380/32

Wobbling of carrier

9
380/273

Rekeying system

127
380/274

Synchronization

115
380/33

Using plural paths or channels

129
380/34

Plural carrier frequencies

431
380/1

Cryptanalysis

52
380/252

Electric signal masking

124
380/253

By signal having discrete frequency component

33
380/254

By signal having discrete step amplitude variation

20
380/287

Electric signal modification

80
380/22

Having magnetic record carrier (e.g., tape, drum)

68
380/26

Having mechanical control of signal encryption (e.g., cam)

25
380/27

By perforated record

9
380/51

Having production of printed copy (e.g., printer, typewriter)

295
380/52

Including particular structure or housing (e.g., display, keyboard)

148
380/53

Audio transducer mounting or structure

9
380/251

Electronic game using cryptography

59
380/2

Equipment test or malfunction indication

128
380/243

Facsimile cryptography

125
380/246

Including generation of an associated coded record

41
380/245

Nonstandard scan pattern

11
380/244

Synchronization

9
380/55

Having production of printed copy (e.g., cryptographic printer or typewriter)

136
380/277

Key management

814
380/44

Having particular key generator

642
380/45

Multiple key level

240
380/46

Nonlinear (e.g., pseudorandom)

608
380/47

Plural generators

182
380/278

Key distribution

399
380/279

Key distribution center

213
380/282

By public key method

256
380/280

Control vector or tag

73
380/281

Using master key (e.g., key-encrypting-key)

248
380/283

User-to-user key distributed over data link (i.e., no center)

248
380/285

By public key method

193
380/284

Using master key (e.g., key-encrypting-key)

147
380/286

Key escrow or recovery

217
380/59

Miscellaneous

159
380/28

Particular algorithmic function encoding

971
380/29

Nbs/des algorithm

335
380/30

Public key

1033
380/56

Selectively movable element having code characters

25
380/57

Rotatable

14
380/58

Characters on peripheral surface (e.g., cylinder section)

5
380/200

Video cryptography

251
380/201

Copy protection or prevention

679
380/203

Having copy protect signal

313
380/202

Having origin or program id

200
380/204

Modifying sync signal

106
380/205

Video electric signal masking

74
380/208

Including filter for removing masking signal

40
380/207

Including locally generated masking signal

30
380/206

Masking of synchronization signal

39
380/209

Masking signal selectively addressed

42
380/210

Video electric signal modification (e.g., scrambling)

263
380/221

By modifying synchronizing signal

71
380/222

Including phase inversion of scan line information

30
380/224

Including pseudo-synchronizing pulse

30
380/226

Key signal in blanking interval

60
380/223

Key signal on separate carrier

59
380/225

Self-synchronizing circuit at receiver

34
380/220

Carrier frequency conversion

30
380/219

Carrier phase shift

23
380/213

Chrominance scrambling

49
380/239

Encrypted code control signal

254
380/216

Image data converted to digital before modification

108
380/217

Having compression (e.g., mpeg)

150
380/240

Including addressed decoder control signal

176
380/242

Having command signal for receiver

117
380/241

Having program id or authorization

238
380/211

Interactive tv

98
380/236

Modifying accompanying audio signal

64
380/237

Including digital audio

53
380/238

Including frequency modification of audio signal or frequency shifting of audio carrier

41
380/214

Nonstandard scan pattern of video information

38
380/215

Line cut and shuffle

57
380/235

Phase inversion of scan line information

41
380/212

Plural video stream multiplexing

118
380/227

Record or coin controlled

72
380/229

Including authentication

91
380/228

Including key on record

116
380/230

Including usage recording

55
380/231

Usage or charge determination

130
380/232

Including authentication

95
380/234

Including display of supplemental information

40
380/233

Including usage or charge recording at subscriber station

56
380/218

Variable time delay modulation of baseband video signal

36
 
 
  Recently Added Patents
Intelligent filtering for contact spanning multiple access networks
Bicyclic compound, production and use thereof
Thrust section wear preventor
Scalable graphics processing for remote display
Flip chip interconnection pad layout
Compression system for integrated sensor devices
Liquid droplet ejection method, head unit, liquid droplet ejection device, electro-optical device, and electronic equipment
  Randomly Featured Patents
Automatic audio and video parameter adjustment
Phase technique for active damping in a servo-controlled actuator
Electrodeless discharge energy supply apparatus and electrodeless discharge lamp device using surface wave transmission line
Battery-powered electronic device with spaced contact extensions
Wind energy collection system
Cooler with pocketed lid
Snuff box holder
Radio receiving apparatus for receiving communication signals of different bandwidths
MOS type semiconductor apparatus
Cardable blends of dual glass fibers