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Class Information
Number: 379/380
Name: Telephonic communications > Supervisory or control line signaling > Using line or loop condition detection (e.g., line circuit) > By bridge circuit
Description: Subject matter including a network arranged so that, when an electromotive force is present across one branch, the response of a suitable detecting device in another branch may be zeroed by suitable adjustment of the electrical consistents of still other branches.

Patents under this class:

Patent Number Title Of Patent Date Issued
8653598 Electrical switch using gated resistor structures and three-dimensional integrated circuits using the same Feb. 18, 2014
7933398 System and method for call bridging in a call center using a virtual private network Apr. 26, 2011
7907720 Test method for line equipment including a hybrid circuit and line equipment for its implementation Mar. 15, 2011
7896228 Cash dispensing automated banking machine system and method Mar. 1, 2011
7864948 Systems and methods for an electronic hook switch for customer premises equipment Jan. 4, 2011
7813490 Methods and apparatus for implementing customized ringback Oct. 12, 2010
7463732 Flexible data outlet Dec. 9, 2008
7206403 Telephone terminal equipment interface circuit Apr. 17, 2007
7103175 Systems and methods for an electronic hook switch for customer premises equipment Sep. 5, 2006
7094110 Computer disconnect device Aug. 22, 2006
6925170 Wire-bound telecommunication device and a circuit for use in such a device Aug. 2, 2005
6868156 Non-voice signal repeater for speech coders Mar. 15, 2005
6845157 Linear polarity guard and method for DSL-ready pots devices Jan. 18, 2005
6829352 Amplifier arrangement Dec. 7, 2004
6631190 Telephone system Oct. 7, 2003
6393123 Method and modem circuit for determining connection status of a phone line May. 21, 2002
6141416 Analog telephone subscriber terminal apparatus Oct. 31, 2000
6044150 Method and apparatus for a host-based personal computer speakerphone Mar. 28, 2000
5812658 Method and circuit for failsafe switch-hook detection during fault in a telephone system Sep. 22, 1998
5659602 Telephone apparatus for caller ID Aug. 19, 1997
5600715 Integrated loop current detector apparatus for a PSTN modem Feb. 4, 1997
5559873 Telephone privacy device with conference and indicator features Sep. 24, 1996
5461670 Telephone subscriber system incorporating a drive interface for a telephone line switch at a different reference potential Oct. 24, 1995
5287404 Telephone subscriber line voltage change detection Feb. 15, 1994
5255182 Payment card point-of-sale service quality monitoring system, apparatus, and method Oct. 19, 1993
5155764 Telephone set with on-hook line seizure Oct. 13, 1992
5111502 Telephone line bridging sensor May. 5, 1992
5020100 Telephone line loop current regulator May. 28, 1991
4935959 Two-wire telecommunications line detection arrangements Jun. 19, 1990
4899379 Circuit arrangement for the connection of line circuits of a digital time multiplex-telephone network Feb. 6, 1990
4864605 Telephone trunk interface circuit Sep. 5, 1989
4841568 Circuit arrangement for a telephone station with earth connection to the central supply device Jun. 20, 1989
4809322 Circuit arrangement for a telephone station with ground connection Feb. 28, 1989
4454477 Loop current detector with threshold setting impedance Jun. 12, 1984
4444999 Automatic electronic disconnector for subscriber terminal equipment Apr. 24, 1984
4439634 Carrier subscriber telephone off-hook detector Mar. 27, 1984
4320265 Line repeater for telephone system using radio links Mar. 16, 1982
4319092 Current detection circuit arrangement for an automatic telephone exchange Mar. 9, 1982
4224478 Data transmission circuit for establishing a bidirectional data path in a telephone system Sep. 23, 1980
4220825 Telephone status monitor circit Sep. 2, 1980
4216355 Telephone line monitoring apparatus Aug. 5, 1980
4172215 Transformer coupling circuit providing for cancellation of D.C. fluxes Oct. 23, 1979
4151377 High impedance loop-seizing and dial pulsing circuit Apr. 24, 1979
4126765 Detector circuit for sensing battery polarity and loop closure Nov. 21, 1978
4105872 Electronic telephone system including interexchange trunk repeaters for traffic with other systems Aug. 8, 1978
4099032 Loop current detector Jul. 4, 1978
4087646 Dual mode telephone subscriber loop current detector May. 2, 1978
4049919 Communication system trunk circuit Sep. 20, 1977
3974343 Small modular communications switching system with distributed programmable control Aug. 10, 1976

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