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Your search returned 24 patents.
( 379/195 in Current US Classification ) |
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| 1 |
| Patent ID | Title | Date Filed |
| 7177410 | Local control of call features in a telephone system
| April 19, 2005 |
| 6882716 | Local control of call features in a telephone system
| March 28, 2001 |
| 6275573 | System and method for secured network access
| June 2, 1998 |
| 6081546 | Telephone line seizure circuit
| December 31, 1997 |
| 5937058 | Coordinating telephones or adjuncts on the same loop
| September 19, 1996 |
| 5583924 | Caller ID and call waiting for multiple CPES on a single telephone line
| February 13, 1995 |
| 5574777 | Caller ID and call waiting for multiple CPES on a single telephone line
| June 7, 1995 |
| 5534855 | Method and system for certificate based alias detection
| December 15, 1994 |
| 5483573 | Electric circuit connector with auto-termination
| June 30, 1993 |
| 5392334 | Off-hook detection and soft line seizure for telephone line sharing in a computer system
| August 25, 1993 |
| 5392332 | Shared line telephone answering system with a telephone line-powered disconnect module
| May 27, 1992 |
| 5231658 | Telephone privacy device
| February 25, 1992 |
| 5029202 | Incoming telephone call director
| March 19, 1990 |
| 4958370 | Control system for a plurality of telephone sets
| April 4, 1988 |
| 4805210 | Automatic telephone line sharing and lockout apparatus
| September 10, 1987 |
| 4444999 | Automatic electronic disconnector for subscriber terminal equipment
| August 23, 1982 |
| 4307454 | Arrangement preventing multiple connections to peripheral circuits
| December 21, 1978 |
| 4230914 | System for and method of indicating intruder presence on telephone lines, and method of installation of telephone intruder alarm system
| November 30, 1978 |
| 4121053 | Telephone command apparatus
| May 5, 1977 |
| 4095056 | Toll restrictor access circuit
| February 28, 1977 |
| 4009337 | Stored program control type electronic exchange system
| October 10, 1974 |
| 3941952 | Telephone exchange system employing means capable of breaking a connection between a terminal unit and a switch frame using mechanical latching type crossbar switches
| December 21, 1973 |
| 3930126 | Two relay line circuit
| August 14, 1974 |
| 3904832 | Trunk circuit for crossbar switching systems
| May 2, 1974 |
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