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Class Information
Number: 379/160
Name: Telephonic communications > Multi-line or key substation system with selective switching and central switching office connection > With intercom system > With connection of intercom station to subscriber line
Description: Subject matter including connecting an intercom instrument to a public telephone line.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7623640 |
Door intercom system |
Nov. 24, 2009 |
| 7529557 |
Press-to-connect for wireless communications systems |
May. 5, 2009 |
| 7418265 |
System and method for interrupt control on a handheld device |
Aug. 26, 2008 |
| 7109860 |
Surveillance apparatus integrated with mobile phone |
Sep. 19, 2006 |
| 7039019 |
Telephone exchanging apparatus and telephone system |
May. 2, 2006 |
| 6882715 |
Method and apparatus for communication with a gate entry controller and providing secure communication |
Apr. 19, 2005 |
| 6760419 |
Method and apparatus for interfacing a drive-thru intercom system with a telephone system |
Jul. 6, 2004 |
| 6721408 |
Method and apparatus for recording or forwarding messages |
Apr. 13, 2004 |
| 6631179 |
Voice and motion activated telephone |
Oct. 7, 2003 |
| 6539084 |
Intercom system |
Mar. 25, 2003 |
| 6476902 |
Liquid crystal display and method of making same |
Nov. 5, 2002 |
| 6438221 |
Electronote wall mounted messaging device |
Aug. 20, 2002 |
| 6310940 |
Personal computer interactive phone system |
Oct. 30, 2001 |
| 6233328 |
Door intercom |
May. 15, 2001 |
| 5838784 |
One-touch dialing apparatus and method for registering dialing numbers in a telephone system |
Nov. 17, 1998 |
| 5832077 |
Microphone/loudspeaker having a speakerphone mode and a microphone/loudspeaker mode |
Nov. 3, 1998 |
| 5825868 |
Arrangement for providing private-network line features on central-office-to-PBX trunks |
Oct. 20, 1998 |
| 5748722 |
Collective-house control system employing an interface circuit for alternative mark inversion control communication |
May. 5, 1998 |
| 5644630 |
Intercom system for a service establishment |
Jul. 1, 1997 |
| 5596631 |
Station controller for distributed single line PABX |
Jan. 21, 1997 |
| 5283825 |
Telephone adaptor for telephone sets |
Feb. 1, 1994 |
| 5267306 |
Telephone apparatus with conditional operation |
Nov. 30, 1993 |
| 5202917 |
Telephone calling method and telephone apparatus |
Apr. 13, 1993 |
| 5127045 |
Identifying telephone controller system |
Jun. 30, 1992 |
| 5090052 |
Telephone system with multiple extension telephones |
Feb. 18, 1992 |
| 5031210 |
Telephone apparatus |
Jul. 9, 1991 |
| 5027391 |
Call management system |
Jun. 25, 1991 |
| 5027341 |
Station line switching control system |
Jun. 25, 1991 |
| 4998274 |
ISDN dual bus extension phone system |
Mar. 5, 1991 |
| 4996709 |
Intercom telephone |
Feb. 26, 1991 |
| 4943997 |
Device for communicating a doorside intercom set with a remote telephone |
Jul. 24, 1990 |
| 4868847 |
Telephone intercom device |
Sep. 19, 1989 |
| 4794640 |
Switching control apparatus for intercom-telephone sets |
Dec. 27, 1988 |
| 4769837 |
Device for adding intercom functions to a phone system |
Sep. 6, 1988 |
| 4754476 |
Premises page/intercom system utilizing telephone set component |
Jun. 28, 1988 |
| 4734932 |
Telephone local intercom system |
Mar. 29, 1988 |
| 4731821 |
Single wire telephone intercommunication system |
Mar. 15, 1988 |
| 4706274 |
Cordless telephone system |
Nov. 10, 1987 |
| 4706244 |
Frequency multiplexed telephone system |
Nov. 10, 1987 |
| 4691345 |
Multifunction two line telephone system |
Sep. 1, 1987 |
| 4554411 |
Intercom system |
Nov. 19, 1985 |
| 4518821 |
Restaurant telephone entertainment system |
May. 21, 1985 |
| 4459434 |
Home telephone exchange |
Jul. 10, 1984 |
| 4329543 |
Communication system |
May. 11, 1982 |
| 4081615 |
Subset switching means in apparatus for a key telephone system for enabling intercom substations to access trunk lines |
Mar. 28, 1978 |
| 4016372 |
Apparatus for a key telephone system for enabling intercom substations to access trunk lines |
Apr. 5, 1977 |
| 3931477 |
Telephone intercommunication systems |
Jan. 6, 1976 |
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