H04K - Secret communication; Jamming of communication

More topics under "H04K - Secret communication; Jamming of communication" (18,722)
H04K 1 - Secret communication (16,771)
H04K 3 - Jamming of communication; Counter-measures (1,951)

Patents for H04K - Secret communication; Jamming of communication (26)
02/2011
02/01/2011	US7881227 Methods for spreading or preventing spreading of information in a network
07/2009
07/15/2009	CN100514899C Improved CFM mode system
06/2009
06/04/2009	US20090141652 Methods for Spreading or Preventing Spreading of Information In a Network
01/2009
01/07/2009	EP1900148B1 Methods for spreading or preventing spreading of information in a network
03/2008
03/19/2008	EP1900148A1 Methods for spreading or preventing spreading of information in a network
01/2007
01/18/2007	WO2007008078A1 Methods for spreading or preventing spreading of information in a network
07/2006
07/06/2006	WO2004082184A3 Data randomization in a wireless communication system
04/2006
04/05/2006	CN1757189A CFM mode system
03/2006
03/21/2006	US7016326 Method and apparatus for effecting handoff between different cellular communications systems
11/2004
11/11/2004	US20040223472 Data randomization in a wireless communication system
09/2004
09/23/2004	WO2004082184A2 Data randomization in a wireless communication system
06/2003
06/12/2003	US20030108007 Method and apparatus for effecting handoff between different cellular communications systems
04/1992
04/15/1992	EP0280718B1 Hidden preamble for frequency hopped synchronization
04/14/1992	CA1298899C Hybrid communications system
12/1990
12/05/1990	CN1010732B Digital radio frequency receiver
01/1990
01/03/1990	EP0060299B1 Multiple signal transmission method and system, particularly for television
07/1989
07/04/1989	CA1256946A1 Hidden preamble for frequency hopped synchronization
09/1988
09/07/1988	EP0280718A1 Hidden preamble for frequency hopped synchronization.
06/1988
06/21/1988	US4752939 Hidden preamble for frequency hopped synchronization
03/1988
03/10/1988	WO1988001816A1 Hidden preamble for frequency hopped synchronization
05/1987
05/20/1987	CN86105333A 数字射频接收机 Digital RF Receiver
02/1986
02/18/1986	CA1200894A1 Multiple signal transmission method and system, particularly for television
01/1986
01/07/1986	EP0060299A4 Multiple signal transmission method and system, particularly for television.
08/1983
08/09/1983	US4398216 Multiple signal transmission method and system, particularly for television
09/1982
09/22/1982	EP0060299A1 Multiple signal transmission method and system, particularly for television.
04/1982
04/01/1982	WO1982001109A1 Multiple signal transmission method and system,particularly for television