TREA

Circuit arrangements in which for one subscriber low frequency speech and/or signalling signals proceed on the line, while for the other subscriber the low frequency speech and/or signalling signals are modulated upon a high frequency carrier signal

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  • CPC
  • H04Q5/245
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Parent Industries

HELECTRICITY H04Electric communication H04QSELECTING H04Q5/00Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

Current Industry

H04Q5/245Circuit arrangements in which for one subscriber low frequency speech and/or signalling signals proceed on the line, while for the other subscriber the low frequency speech and/or signalling signals are modulated upon a high frequency carrier signal
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Single channel subscriber carrier system
    • Patent number 4,653,046
    • Issue date Mar 24, 1987
    • Brand-Rex Company
    • Gary Eisenhauer
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Interference limiting two-port network for 1+1 type transmission sy...
    • Patent number 4,418,245
    • Issue date Nov 29, 1983
    • Compagnie Industrielle des Telecommunications Cit-Alcatel
    • Yves-Marie Le Grand
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Device for conveying a high-voltage low-frequency signal over a car...
    • Patent number 4,197,433
    • Issue date Apr 8, 1980
    • Compagnie Industrielle des Telecommunications Cit-Alcatel
    • Francois Bronner
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Variable delay ringing detector
    • Patent number 4,103,114
    • Issue date Jul 25, 1978
    • Bell Telephone Laboratories, Incorporated
    • Barry Sheldon Bosik
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Battery charging circuit
    • Patent number 4,048,551
    • Issue date Sep 13, 1977
    • Bell Telephone Laboratories, Incorporated
    • Barry Sheldon Bosik
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3927266
    • Patent number 3,927,266
    • Issue date Dec 16, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3902017
    • Patent number 3,902,017
    • Issue date Aug 26, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3700817
    • Patent number 3,700,817
    • Issue date Oct 24, 1972
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3639692
    • Patent number 3,639,692
    • Issue date Feb 1, 1972
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3624300
    • Patent number 3,624,300
    • Issue date Nov 30, 1971
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3614323
    • Patent number 3,614,323
    • Issue date Oct 19, 1971
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3588361
    • Patent number 3,588,361
    • Issue date Jun 28, 1971
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3510584
    • Patent number 3,510,584
    • Issue date May 5, 1970
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE