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Current supply source at subordinate switching centre charged from main exchange

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  • CPC
  • H04M19/06
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Parent Industries

HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M19/00Current supply arrangements for telephone systems

Current Industry

H04M19/06Current supply source at subordinate switching centre charged from main exchange
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Modular housing system for outside plant telecommunications equipment
    • Patent number 7,734,040
    • Issue date Jun 8, 2010
    • Adtran, Inc.
    • John Wise Ayres, III
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Remote terminal unit connector
    • Patent number 7,734,037
    • Issue date Jun 8, 2010
    • Verizon Services Corp.
    • Stephen L. Alvey
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Telephone terminal device
    • Patent number 5,157,711
    • Issue date Oct 20, 1992
    • Kabushiki Kaisha Toshiba
    • Masanobu Shimanuki
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Power transmission arrangement for telecommunications systems
    • Patent number 4,685,129
    • Issue date Aug 4, 1987
    • American Telephone and Telegraph Company, AT&T Bell Laboratories
    • Charles D. Gavrilovich
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Power supply control circuit for subscriber carrier telephone system
    • Patent number 4,374,303
    • Issue date Feb 15, 1983
    • GTE Automatic Electric Laboratories, Inc.
    • James A. Stewart
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Power supply control circuit for subscriber carrier telephone system
    • Patent number 4,145,572
    • Issue date Mar 20, 1979
    • GTE Automatic Electric Laboratories, Inc.
    • James A. Stewart
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Telephone ringing control circuits
    • Patent number 4,025,729
    • Issue date May 24, 1977
    • Bell Telephone Laboratories, Incorporated
    • Dale Eugene Stone
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3867681
    • Patent number 3,867,681
    • Issue date Feb 18, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3800095
    • Patent number 3,800,095
    • Issue date Mar 26, 1974
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3506789
    • Patent number 3,506,789
    • Issue date Apr 14, 1970
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2829204
    • Patent number 2,829,204
    • Issue date Apr 1, 1958
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2252527
    • Patent number 2,252,527
    • Issue date Aug 12, 1941
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    2252549
    • Patent number 2,252,549
    • Issue date Aug 12, 1941
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2251302
    • Patent number 2,251,302
    • Issue date Aug 5, 1941
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1435950
    • Patent number 1,435,950
    • Issue date Nov 21, 1922
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents