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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 3997733 |
Intrinsically safe communication systems |
Dec. 14, 1976 |
| 3935994 |
Security mailbox |
Feb. 3, 1976 |
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