TREA

for two-party-line systems

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Industry

  • CPC
  • H04Q5/24
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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

H04Q5/24for two-party-line systems
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Walkie-talkie device, electronic apparatus, walkie-talkie informati...
    • Patent number 11,012,551
    • Issue date May 18, 2021
    • Shenzhen Wistek Energy Co., Ltd.
    • Hui Sun
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Method and device for adjusting frequencies of intercom apparatuses
    • Patent number 10,439,660
    • Issue date Oct 8, 2019
    • BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.
    • Yueyue Chu
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Radio frequency noise management
    • Patent number 10,255,590
    • Issue date Apr 9, 2019
    • Square, Inc.
    • Jeremy Wade
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Circuit arrangement for the transmission of communication signals
    • Patent number 4,797,874
    • Issue date Jan 10, 1989
    • kabelmetal electro Gesellschaft mit beschrankter Haftung
    • Ziaedin Chahabadi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Capacity expander for telephone line
    • Patent number 4,755,994
    • Issue date Jul 5, 1988
    • Republic Telcom Systems Corporation
    • Lester H. Staples
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • 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

    Station identification circuit arrangement
    • Patent number 4,459,433
    • Issue date Jul 10, 1984
    • TII Industries Inc.
    • Donald W. Wortman
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Switching network interfacing telephone-exchange equipment with two...
    • Patent number 4,435,619
    • Issue date Mar 6, 1984
    • Italtel Societa Italiana Telecomunicazioni S.p.A.
    • Ennio Bonaparte
    • 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

    Party line apparatus
    • Patent number 4,310,723
    • Issue date Jan 12, 1982
    • Carl G. Svala
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Subscriber drop-connected circuits
    • Patent number 4,209,667
    • Issue date Jun 24, 1980
    • TII Industries, Inc.
    • Frank L. Simokat
    • 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

    Electronic side of line detector
    • Patent number 3,939,308
    • Issue date Feb 17, 1976
    • GTE Automatic Electric (Canada) Limited
    • David M. Shaver
    • 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

    3863036
    • Patent number 3,863,036
    • Issue date Jan 28, 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

    3673330
    • Patent number 3,673,330
    • Issue date Jun 27, 1972
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3649778
    • Patent number 3,649,778
    • Issue date Mar 14, 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

    3579254
    • Patent number 3,579,254
    • Issue date May 18, 1971
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3530253
    • Patent number 3,530,253
    • Issue date Sep 22, 1970
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

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

    2957055
    • Patent number 2,957,055
    • Issue date Oct 18, 1960
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2923775
    • Patent number 2,923,775
    • Issue date Feb 2, 1960
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents