TREA

in systems employing carrier frequencies

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  • CPC
  • H04M7/16
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Parent Industries

HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M7/00Interconnection arrangements between switching centres

Current Industry

H04M7/16in systems employing carrier frequencies
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    PBX ground start trunk interface for station carrier systems
    • Patent number 3,936,614
    • Issue date Feb 3, 1976
    • Stromberg-Carlson Corporation
    • Morris A. Suntop
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Automatic disconnect circuit for subscriber carrier telephone system
    • Patent number 3,934,089
    • Issue date Jan 20, 1976
    • GTE Automatic Electric Laboratories Incorporated
    • James A. Stewart
    • 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

    3904833
    • Patent number 3,904,833
    • Issue date Sep 9, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3903367
    • Patent number 3,903,367
    • Issue date Sep 2, 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

    3860757
    • Patent number 3,860,757
    • Issue date Jan 14, 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

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

    3501591
    • Patent number 3,501,591
    • Issue date Mar 17, 1970
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3476883
    • Patent number 3,476,883
    • Issue date Nov 4, 1969
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3475561
    • Patent number 3,475,561
    • Issue date Oct 28, 1969
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3471650
    • Patent number 3,471,650
    • Issue date Oct 7, 1969
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3086171
    • Patent number 3,086,171
    • Issue date Apr 16, 1963
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3029312
    • Patent number 3,029,312
    • Issue date Apr 10, 1962
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2932694
    • Patent number 2,932,694
    • Issue date Apr 12, 1960
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2857464
    • Patent number 2,857,464
    • Issue date Oct 21, 1958
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2837605
    • Patent number 2,837,605
    • Issue date Jun 3, 1958
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2751436
    • Patent number 2,751,436
    • Issue date Jun 19, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2744958
    • Patent number 2,744,958
    • Issue date May 8, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2735898
    • Patent number 2,735,898
    • Issue date Feb 21, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2721897
    • Patent number 2,721,897
    • Issue date Oct 25, 1955
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2626319
    • Patent number 2,626,319
    • Issue date Jan 20, 1953
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2584259
    • Patent number 2,584,259
    • Issue date Feb 5, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2564378
    • Patent number 2,564,378
    • Issue date Aug 14, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2564048
    • Patent number 2,564,048
    • Issue date Aug 14, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2559165
    • Patent number 2,559,165
    • Issue date Jul 3, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2551588
    • Patent number 2,551,588
    • Issue date May 8, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2547617
    • Patent number 2,547,617
    • Issue date Apr 3, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2545642
    • Patent number 2,545,642
    • Issue date Mar 20, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents