H04M - Telephonic communication

More topics under "H04M - Telephonic communication" (383,243)
H04M 1 - Substation equipment, e.g. for use by subscribers (168,223)
H04M 11 - Telephonic communication systems specially adapted for combination with other electrical systems (53,055)
H04M 13 - Party-line systems (159)
H04M 15 - Arrangements for metering, time-control or time-indication (14,957)
H04M 17 - Prepayment telephone systems (5,258)
H04M 19 - Current supply arrangements for telephone systems (7,475)
H04M 3 - Automatic or semi-automatic exchanges (99,881)
H04M 5 - Manual exchanges (1,342)
H04M 7 - Arrangements for interconnection between switching centres (24,777)
H04M 9 - Arrangements for interconnection not involving centralised switching (8,105)
H04M 99 - Subject matter not provided for in other groups of this subclass (11)

Patents for H04M - Telephonic communication (1,054)
11/1995
11/14/1995	US5467384 Method and apparatus for providing power to a coaxial cable network
10/1995
10/18/1995	CN1110494A Method and apparatus for providing power to a coaxial cable network
09/1995
09/08/1995	WO1995024094A1 Charging for usage of a telecommunications network
09/08/1995	WO1995024093A1 Pricing method for telecommunication system
05/1995
05/17/1995	EP0653136A1 Method and apparatus for providing power to a coaxial cable network
12/1994
12/08/1994	WO1994028671A1 Method and apparatus for providing power to a coaxial cable network
12/07/1994	CN1026940C A method and arrangement for supplying direct current to a telephone line
08/1994
08/02/1994	US5335272 Method and arrangement for supplying direct current to a telephone line
07/1994
07/26/1994	CA1331040C High capacity sectorized cellular communication system
06/1994
06/21/1994	US5323453 Power down feed
12/1993
12/23/1993	WO1993026113A1 Service platform
06/1992
06/09/1992	US5121391 Subscriber RF telephone system for providing multiple speech and/or data singals simultaneously over either a single or a plurality of RF channels
06/02/1992	US5119375 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
03/1992
03/18/1992	EP0475135A1 Transmission system for connection network in communication networks
03/04/1992	EP0204718B1 Full duplex speakerphone for radio and landline telephones
10/1991
10/16/1991	EP0452286A1 Arrangement for reduced power supply to a subscriber line
09/1991
09/16/1991	WO1991014333A1 An arrangement for reduced power supply
09/16/1991	CA2074479A1 Arrangement for reduced power supply
08/1991
08/14/1991	CN1053873A Method and apparatus for supplying direct current to telephone line
08/07/1991	EP0440006A1 A method and arrangement for supplying direct current to a telephone line
08/02/1991	WO1991011876A1 A method and arrangement for supplying direct current to a telephone line
08/02/1991	CA2070785A1 Method and arrangement for supplying direct current to a telephone line
06/1991
06/04/1991	US5022024 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
02/1991
02/06/1991	CN1011561B Base station for wireless digital telephone system
07/1990
07/25/1990	CN1008962B Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels
03/1990
03/27/1990	US4912705 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
11/1989
11/15/1989	EP0116625B1 Multiple simultaneous tone decoder
09/1989
09/13/1989	CN1035596A Passive universal communication
06/1989
06/06/1989	CA1255401A1 Remote multiplexer for digital telephone system
03/1989
03/28/1989	US4817089 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
03/08/1989	CN1003555B Full duplex speakerphone for radio and landline telephones
02/1989
02/28/1989	CA1250673A1 Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels
02/22/1989	CN1031305A Base station for wireless digital telephone system
10/1988
10/11/1988	US4777633 Base station for wireless digital telephone system
03/1988
03/15/1988	CA1234235A1 Full duplex speakerphone for radio and landline telephones
06/1987
06/23/1987	US4675863 Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
03/1987
03/04/1987	CN86200958U Bass of standard module for telephone installations
02/1987
02/26/1987	EP0116625A4 Multiple simultaneous tone decoder.
12/1986
12/16/1986	US4629829 Full duplex speakerphone for radio and landline telephones
11/1986
11/19/1986	CN85109020A Full duplex speakerphone for radio and landline telephones
10/1986
10/15/1986	CN86100949A Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels
07/1986
07/03/1986	WO1986003912A1 Full duplex speakerphone for radio and landline telephones
02/1986
02/04/1986	CA1200316A1 Multiple simultaneous tone decoder
08/1984
08/29/1984	EP0116625A1 Multiple simultaneous tone decoder.
06/1984
06/19/1984	US4455617 Multiple simultaneous tone decoder
03/1984
03/15/1984	WO1984001044A1 Multiple simultaneous tone decoder
03/13/1984	US4436196 Method of and apparatus for assessing coins
02/1983
02/09/1983	EP0070872A1 Cordless telephone system
12/1982
12/08/1982	EP0066013A1 Article recognition system and processor controlled system
10/1982
10/14/1982	WO1982003517A1 Cordless telephone system
01/1982
01/06/1982	EP0043189A1 Method of and apparatus for assessing coins
01/1981
01/20/1981	CA1094209A1 System for monitoring the operational ability of data processing equipment
08/1979
08/14/1979	CA1060208A1 Toy telephone having recorded messages
08/1978
08/08/1978	US4104821 Toy telephone with bell and recorded messages

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