| Patents for H04K 1 - Secret communication (16,771) |
|---|
| 01/31/1989 | CA1249507A1 Protective fence for press |
| 01/25/1989 | EP0300678A2 Scrambling of analogue electrical signals |
| 01/25/1989 | EP0300464A2 Voice band splitting scrambler |
| 01/25/1989 | CN1030678A High effective and reliable group transmission mode of informations |
| 01/25/1989 | CN1030658A Duplex analog scrambler |
| 01/17/1989 | US4799257 Wireless transmission system for PM modulation signal |
| 01/17/1989 | CA1249032A1 Pay per view entertainment system |
| 01/03/1989 | US4796299 Video encoder apparatus |
| 12/29/1988 | WO1988010541A1 Duplex analog scrambler |
| 12/28/1988 | EP0131573B1 Ram air combustion steering system for a guided missile |
| 12/21/1988 | EP0295580A2 Duplex analog scrambler |
| 12/20/1988 | US4792973 Selective enablement of descramblers |
| 12/20/1988 | US4792971 Selective viewing control system for CATV |
| 12/07/1988 | EP0293866A2 Secret speech equipment |
| 12/06/1988 | US4790009 Scrambler system |
| 11/23/1988 | EP0292342A1 System for the reciprocal analogous authentication between a terminal and a transmission line |
| 11/15/1988 | CA1244886A1 Secure communication system |
| 10/04/1988 | US4776013 Method and apparatus of encryption of optical images |
| 10/04/1988 | CA1242793A1 Key signal encryption and distribution system for controlling scrambling and selective, remote descrambling of television signals |
| 09/20/1988 | US4773092 Speech scramblers |
| 09/13/1988 | US4771457 Subscription television system |
| 09/13/1988 | US4771456 Cable television channel selector/descrambler for use with cable-ready video applicances |
| 09/13/1988 | US4771455 Scrambling apparatus |
| 07/26/1988 | US4760598 Coded data transmission system |
| 07/20/1988 | CN87208534U Digital integrated circuit noise signal generator |
| 07/12/1988 | US4757536 Method and apparatus for transceiving cryptographically encoded digital data |
| 07/06/1988 | EP0273289A2 Bit synchronization method for a digital radiotelephone system |
| 06/28/1988 | US4754481 Expanded partial response processing for analog signal enciphering and the like |
| 06/22/1988 | EP0271748A2 System for processing scrambled transmission information |
| 06/21/1988 | US4752953 Digital audio scrambling system with pulse amplitude modulation |
| 06/08/1988 | EP0270147A1 Analogous cryptographic device using a dynamic band permutation |
| 06/07/1988 | US4750205 Frequency or time domain speech scrambling technique and system which does not require any frame synchronization |
| 06/07/1988 | CA1237779A1 Transmitter/receiver for signals on the scramble unit |
| 05/24/1988 | US4747137 Speech scrambler |
| 05/18/1988 | CN87106044A Security arrangement for telecommunications exchange system |
| 05/16/1988 | EP0181863A4 Tamper-resistant, expandable communications system. |
| 05/11/1988 | EP0266605A2 Cable television channel selector/descrambler for the use with cable-ready video appliances |
| 05/10/1988 | US4744080 Apparatus for receiving digital sound/data information |
| 05/03/1988 | US4742546 Privacy communication method and privacy communication apparatus employing the same |
| 05/03/1988 | US4742545 Video picture signal scrambling system |
| 04/28/1988 | DE3630794C1 Method for exchanging binary characters in accordance with a pattern |
| 04/27/1988 | EP0265349A2 Multichannel signal distribution control system |
| 04/26/1988 | CA1235769A1 Method and apparatus for transmitting and receiving a ciphered analog signal |
| 04/20/1988 | EP0151147B1 Security system for television signal encryption |
| 04/19/1988 | US4739510 Direct broadcast satellite signal transmission system |
| 04/12/1988 | US4737990 Unauthorized channel jamming signal applying method for CATV system |
| 04/05/1988 | US4736420 Video scrambling by segmenting video information lines |
| 03/24/1988 | WO1988000786A3 Security arrangement for a telecommunications exchange system |
| 03/23/1988 | EP0260886A2 Video scrambling by segmenting video information lines |
| 03/22/1988 | US4733209 Ceramic Scrambler module |
| 03/16/1988 | CN86209022U Analog phonetic cryptographic coder |
| 03/15/1988 | US4731839 Method for coding and de-coding audio and video information |
| 03/09/1988 | EP0258701A2 Secure communication system |
| 02/24/1988 | EP0256596A2 Decoding transmitted scrambled signals |
| 02/23/1988 | US4727579 Scrambled television signals |
| 02/16/1988 | US4726064 Wireless reception system |
| 02/16/1988 | US4725882 Scrambled video signal processor |
| 02/16/1988 | CA1232962A1 Scrambled television signals |
| 02/02/1988 | US4723283 Data transmission system |
| 01/28/1988 | WO1988000786A2 Security arrangement for a telecommunications exchange system |
| 01/27/1988 | EP0254559A2 Security arrangement for a telecommunications exchange system |
| 01/14/1988 | WO1988000416A1 Gateway system and method for interconnecting telephone calls with a digital voice protected radio network |
| 01/12/1988 | CA1231382A1 Signal transmission system having encoder/decoder without frame synchronization signal |
| 01/07/1988 | EP0251914A2 Ceramic scrambler module |
| 12/08/1987 | US4712238 Selective-subscription descrambling |
| 12/08/1987 | EP0167531A4 Packetized ensemble modem. |
| 12/02/1987 | EP0247790A2 Secure communication system for multiple remote units |
| 12/01/1987 | CA1229931A1 Video terminal with image line disarrangement |
| 12/01/1987 | CA1229909A1 Digital audio scrambling system with error conditioning |
| 11/19/1987 | WO1987007101A1 Concealing reproduced relayed messages |
| 11/17/1987 | CA1229385A1 Method and apparatus for subscription broadcast |
| 11/03/1987 | US4704725 Signal processing apparatus and methods |
| 10/13/1987 | US4700387 Broadcast system for scrambled programming signals |
| 10/13/1987 | CA1228153A1 Television transmission system |
| 09/22/1987 | US4696034 High security pay television system |
| 09/15/1987 | US4694490 Signal processing apparatus and methods |
| 09/15/1987 | CA1226904A1 Method for cryptographic transmission of speech signals and a communication station for performing the method |
| 09/03/1987 | DE3605350A1 Method for masking a message transmitted by radio |
| 09/01/1987 | US4691352 Arrangement for deciphering and decoding television pictures encoded in accordance with the MAC standard and scrambled at transmission by submitting the video signals to cyclic permutations |
| 08/18/1987 | US4688257 Secure wireless communication system utilizing locally synchronized noise signals |
| 08/18/1987 | CA1225758A1 Secure voice transmission |
| 08/11/1987 | US4686707 Program identifier signal receiver |
| 08/11/1987 | CA1225458A1 Descrambler subscriber key production system utilizing key seeds stored in descrambler |
| 07/28/1987 | US4683586 Scrambling system for an audio frequency signal |
| 07/21/1987 | US4682359 Television picture and sound scrambler and method |
| 07/21/1987 | US4682224 System, method, and apparatus for television signal scrambling and descrambling |
| 07/15/1987 | EP0228455A1 Scrambling apparatus |
| 07/08/1987 | EP0228108A2 Receiving scrambled signals |
| 06/16/1987 | US4673975 Television signal scrambling apparatus |
| 05/26/1987 | US4669117 Video terminal with image line disarrangement |
| 05/21/1987 | DE3540173A1 Method for generating basic keys for the encrypted transmission of information |
| 05/13/1987 | EP0221589A1 Device for establishing a connection between a telecommunication network and a controllable system, such as a computer system, provided with an access control unit controllable via a separate network terminal |
| 05/12/1987 | CA1221755A1 Radio signalling equipment |
| 05/06/1987 | EP0220866A2 Speech scramblers |
| 04/21/1987 | US4659875 Electronic system for the secret transmission of audio signals |
| 04/21/1987 | CA1220847A1 Digital code reading apparatus and method |
| 04/16/1987 | DE3536384A1 FM radio system for encrypted transmission of speech signals |
| 04/16/1987 | DE3536373A1 Radio device with pre-emphasiser/de-emphasiser for encrypted transmission of speech signals |
| 04/14/1987 | US4658436 Disguised transmission system and method |
| 04/01/1987 | EP0216595A2 Data encryption |