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Class Information
Number: 379/167.01
Name: Telephonic communications > Private (e.g., house or intercom) or single line system
Description: Subject matter having (a) a plurality of stations none of which is connected to the public telephone system, and (b) two subsets connected by a single line.










Sub-classes under this class:

Class Number Class Name Patents
379/167.03 At booth (e.g., at theater, gas station, etc.) 5
379/167.02 At collective house 13
379/167.05 Doorbell system 33
379/171 Having plural stations with selective calling (e.g., master) 65
379/167.13 Having telephone adaptor system 19
379/167.15 Having transducer circuitry 8
379/174 Including body or apparel supported terminal (e.g., headgear) 8
379/168 Lockout 39
379/167.14 Two-way voice channel 10
379/173 With call addressing 26
379/176 With central power source 14
379/170 With paging 34


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
7952468 Method for originating call May. 31, 2011
7684415 Audio network system Mar. 23, 2010
7642909 System for remotely monitoring a premise Jan. 5, 2010
7567659 Intercom system Jul. 28, 2009
7400716 Multifunctional intercom system with message recording/retrieval functions Jul. 15, 2008
7174003 Method and system for troubleshooting a security system's telephone lines Feb. 6, 2007
7113578 Vandal proof intercom system for apartment buildings Sep. 26, 2006
7085361 Methods and systems for communication from an exterior of a location Aug. 1, 2006
7065196 Entrance intercom system Jun. 20, 2006
7046774 Intercom apparatus May. 16, 2006
7023975 Privacy mode system and method for home network telephone Apr. 4, 2006
7023982 Telephone plug system Apr. 4, 2006
7013000 MTA intercom feature Mar. 14, 2006
6947534 Telephone intercom methods and systems Sep. 20, 2005
6888934 Vehicle intercom system May. 3, 2005
6882715 Method and apparatus for communication with a gate entry controller and providing secure communication Apr. 19, 2005
6879670 Collective housing intercom apparatus Apr. 12, 2005
6711238 Parallel-connected dialing signal transmission inhibiting device for data transfer over a telephone link Mar. 23, 2004
6674844 System for providing modem access via an IR interface in a PBX Jan. 6, 2004
6671360 Intercom system for a building or apartment house Dec. 30, 2003
6631179 Voice and motion activated telephone Oct. 7, 2003
6574312 Electronic patch panel apparatus and method of use Jun. 3, 2003
6539085 Automatic phone line re-allocation Mar. 25, 2003
6438221 Electronote wall mounted messaging device Aug. 20, 2002
6400815 Method and apparatus for subscriber line to telephone call distribution Jun. 4, 2002
6240171 Call controlling apparatus and method used for an order-wire system in a communication system May. 29, 2001
6078653 Integrated telephone intercommunication and alarm electronic controller Jun. 20, 2000
5956631 Multiple terminal device ringing digital subscriber ISDN terminal Sep. 21, 1999
5923743 Single-wire data distribution system and method Jul. 13, 1999
5818918 Personal handy phone system Oct. 6, 1998
5668870 Audible signaling device for informing when a telephone line is available or in use Sep. 16, 1997
5506896 Intercommunication system Apr. 9, 1996
5148468 Door answering system Sep. 15, 1992
5125026 Internal telephone intercom system Jun. 23, 1992
5040207 Two-telephone intercom Aug. 13, 1991
5031210 Telephone apparatus Jul. 9, 1991
4696030 Patient operator intercom arrangements for magnetic resonance imaging systems Sep. 22, 1987
4636585 Telephone installations Jan. 13, 1987
4588859 Two channel audio communication system May. 13, 1986
4503532 Multipoint fiber optic junction terminal Mar. 5, 1985
4396800 Microphone switching device Aug. 2, 1983
4392243 Transceiver having interphone system Jul. 5, 1983
4313033 Apparatus and method for digital combination of delta modulated data Jan. 26, 1982
4123620 Apparatus for controlling the sound generation in the loudspeakers of intercommunicating telephone sets in response to speech signals from the microphones of said telephone sets Oct. 31, 1978
4075426 Parallel silent communicator Feb. 21, 1978
4057688 Intercom embodying tap transducers Nov. 8, 1977
4051325 Speech intercommunication system Sep. 27, 1977
4049911 Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude Sep. 20, 1977
4001506 Home intercom telephone set Jan. 4, 1977
3999015 Aircraft multi-communications system Dec. 21, 1976

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