using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

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H04Q1/38

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HELECTRICITY H04Electric communication H04QSELECTING H04Q1/00Details of selecting apparatus or arrangements for establishing connections among stations for the purpose of transferring information via these connections

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H04Q1/38using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

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Patents Grantslast 30 patents

Information Patent Grant
Antenna arrangement on a circuit board
- Patent number 10,573,970
- Issue date Feb 25, 2020
- Sony Corporation
- Zhinong Ying
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Paystation transmitter ground detect circuitry
- Patent number 4,821,313
- Issue date Apr 11, 1989
- Palco Telecom Inc.
- Gary Grantland
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone line switch
- Patent number 4,815,126
- Issue date Mar 21, 1989
- Alcatel N.V.
- Peter A. Goode
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
DX circuit
- Patent number 4,815,124
- Issue date Mar 21, 1989
- Tellabs, Inc.
- Blaine T. Bowers
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Ground start circuit
- Patent number 4,796,290
- Issue date Jan 3, 1989
- Keptel, Inc.
- Steven B. Perry
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Interswitch line circuit
- Patent number 4,731,827
- Issue date Mar 15, 1988
- D.A.V.I.D. Systems, Inc.
- Samuel F. Wood
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone answering system with line detector
- Patent number 4,701,950
- Issue date Oct 20, 1987
- Amtel Communications, Inc.
- William J. Curtin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for providing a ground reference for telephone...
- Patent number 4,679,232
- Issue date Jul 7, 1987
- American Telephone and Telegraph Company, AT&T Bell Laboratories
- Kenneth L. Brooks
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telecommunication line circuit and associated polarity reversal cir...
- Patent number 4,614,840
- Issue date Sep 30, 1986
- International Standard Electric Corporation
- Luc A. Bienstman
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Grounded tip detector
- Patent number 4,593,156
- Issue date Jun 3, 1986
- ITT Corporation
- Philip T. Martin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Circuit for maintaining the DC voltage on an electrically isolated...
- Patent number 4,551,670
- Issue date Nov 5, 1985
- AT&T Bell Laboratories
- James V. Anders
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Subscriber line interface circuit
- Patent number 4,540,854
- Issue date Sep 10, 1985
- Mitel Corporation
- Patrick R. Beirne
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Ground start detection in telephone loop signalling circuit
- Patent number 4,535,201
- Issue date Aug 13, 1985
- Northern Telecom Limited
- Puran S. Kasbia
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone including resistive array for dialing and system for usin...
- Patent number 4,523,056
- Issue date Jun 11, 1985
- Reliance Electric Company
- Thomas M. Fisher
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Duplex signaling circuit
- Patent number 4,476,557
- Issue date Oct 9, 1984
- AT&T Bell Laboratories
- George Knoedl
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Loop current detector with threshold setting impedance
- Patent number 4,454,477
- Issue date Jun 12, 1984
- AT&T Bell Laboratories
- Daniel M. Joffe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Current sink for DPT channel unit
- Patent number 4,440,979
- Issue date Apr 3, 1984
- GTE Automatic Electric Incorporated
- Gregor D. McGibbon
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Voltage detector
- Patent number 4,336,467
- Issue date Jun 22, 1982
- Bell Telephone Laboratories, Incorporated
- Richard J. Lisco
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Current detection circuit arrangement for an automatic telephone ex...
- Patent number 4,319,092
- Issue date Mar 9, 1982
- U.S. Philips Corporation
- Adrianus W. M. van den Enden
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telecommunication subscriber line access circuit with ground key an...
- Patent number 4,301,334
- Issue date Nov 17, 1981
- Siemens Aktiengesellschaft
- Robert Lechner
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Loop supervision circuit
- Patent number 4,292,473
- Issue date Sep 29, 1981
- International Standard Electric Corporation
- Jan H. G. Venken
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone signalling test system
- Patent number 4,165,450
- Issue date Aug 21, 1979
- Northern Telecom Inc.
- C. Terry Throop
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Duplex telephone signalling system
- Patent number 4,110,565
- Issue date Aug 29, 1978
- Harvey Hubbell, Incorporated
- Mauro L. Gaetano
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic DX signaling circuit
- Patent number 4,101,733
- Issue date Jul 18, 1978
- International Telephone & Telegraph Corporation
- Donald Edward Whitaker
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Reversible current apparatus
- Patent number 4,071,879
- Issue date Jan 31, 1978
- GTE Sylvania Incorporated
- Jerry L. Falk
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Bi-directional signaling apparatus
- Patent number 3,999,013
- Issue date Dec 21, 1976
- Rockwell International Corporation
- Thomas D. Reed
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Dial pulse detector
- Patent number 3,991,324
- Issue date Nov 9, 1976
- International Standard Electric Corporation
- Jan Hubert Ghislaan Venken
- G01 - MEASURING TESTING
Information Patent Grant
System for addressed timemultiplexed telecommunication
- Patent number 3,987,249
- Issue date Oct 19, 1976
- Maxman AG
- Bjorn Andersen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
3894192
- Patent number 3,894,192
- Issue date Jul 8, 1975
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
3886315
- Patent number 3,886,315
- Issue date May 27, 1975
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
AN ANTENNA ARRANGEMENT ON A CIRCUIT BOARD
- Publication number 20180366832
- Publication date Dec 20, 2018
- SONY MOBILE COMMUNICATIONS INC.
- Zhinong YING
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Antenna arrangement on a circuit board

Paystation transmitter ground detect circuitry

Telephone line switch

DX circuit

Ground start circuit

Interswitch line circuit

Telephone answering system with line detector

Method and apparatus for providing a ground reference for telephone...

Telecommunication line circuit and associated polarity reversal cir...

Grounded tip detector

Circuit for maintaining the DC voltage on an electrically isolated...

Subscriber line interface circuit

Ground start detection in telephone loop signalling circuit

Telephone including resistive array for dialing and system for usin...

Duplex signaling circuit

Loop current detector with threshold setting impedance

Current sink for DPT channel unit

Voltage detector

Current detection circuit arrangement for an automatic telephone ex...

Telecommunication subscriber line access circuit with ground key an...

Loop supervision circuit

Telephone signalling test system

Duplex telephone signalling system

Electronic DX signaling circuit

Reversible current apparatus

Bi-directional signaling apparatus

Dial pulse detector

System for addressed timemultiplexed telecommunication

3894192

3886315

Patents Applicationslast 30 patents

AN ANTENNA ARRANGEMENT ON A CIRCUIT BOARD