TREA

for signalling trouble in unoccupied sub-exchanges

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  • CPC
  • H04Q1/26
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Parent Industries

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

Current Industry

H04Q1/26for signalling trouble in unoccupied sub-exchanges
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Buffer for connection data
    • Patent number 6,335,967
    • Issue date Jan 1, 2002
    • Telefonaktiebolaget LM Ericsson (publ)
    • Peter Blomkvist
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Network node event notification in circuit switched environments
    • Patent number 5,999,592
    • Issue date Dec 7, 1999
    • Mitel Corporation
    • Mark R. Sestak
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Alarm notification system and method for a telephone switch
    • Patent number 5,852,649
    • Issue date Dec 22, 1998
    • Rockwell International Corp.
    • Jeffrey D. Hodson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electronic exchange apparatus
    • Patent number 5,461,662
    • Issue date Oct 24, 1995
    • Kabushiki Kaisha Toshiba
    • Katsuyuki Hanai
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Remote maintenance method and device thereof in private branch exch...
    • Patent number 5,276,727
    • Issue date Jan 4, 1994
    • SamSung Electronics, Co. Ltd.
    • Yang-Seon Kim
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Remote maintenance and administration method in a switchboard system
    • Patent number 5,261,061
    • Issue date Nov 9, 1993
    • Samsung Electronics Co., Ltd.
    • Cheol Ju
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Remote maintenance system
    • Patent number 4,989,176
    • Issue date Jan 29, 1991
    • AG Communication Systems Corporation
    • Salim M. Khan
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Remote monitoring apparatus
    • Patent number 4,675,896
    • Issue date Jun 23, 1987
    • The Mountain States Telephone and Telegraph Company
    • David G. Young
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Centralized supervisory system
    • Patent number 4,575,839
    • Issue date Mar 11, 1986
    • Fujitsu Limited
    • Yusuke Ogata
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    DTMF Activated remote telephone line switching and testing
    • Patent number 4,403,119
    • Issue date Sep 6, 1983
    • Conklin Instrument Corporation
    • Charles E. Conklin
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Circuit arrangement for an interference data alarm system in commun...
    • Patent number 4,187,414
    • Issue date Feb 5, 1980
    • Siemens Aktiengesellschaft
    • Franz Fahrenschon
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3560670
    • Patent number 3,560,670
    • Issue date Feb 2, 1971
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3435416
    • Patent number 3,435,416
    • Issue date Mar 25, 1969
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3238311
    • Patent number 3,238,311
    • Issue date Mar 1, 1966
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3082299
    • Patent number 3,082,299
    • Issue date Mar 19, 1963
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2980898
    • Patent number 2,980,898
    • Issue date Apr 18, 1961
    • G08 - SIGNALLING
  • Information Patent Grant

    2894072
    • Patent number 2,894,072
    • Issue date Jul 7, 1959
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2894073
    • Patent number 2,894,073
    • Issue date Jul 7, 1959
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2876300
    • Patent number 2,876,300
    • Issue date Mar 3, 1959
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2859285
    • Patent number 2,859,285
    • Issue date Nov 4, 1958
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2815405
    • Patent number 2,815,405
    • Issue date Dec 3, 1957
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2773138
    • Patent number 2,773,138
    • Issue date Dec 4, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2744170
    • Patent number 2,744,170
    • Issue date May 1, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2623956
    • Patent number 2,623,956
    • Issue date Dec 30, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2584857
    • Patent number 2,584,857
    • Issue date Feb 5, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2580757
    • Patent number 2,580,757
    • Issue date Jan 1, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2564013
    • Patent number 2,564,013
    • Issue date Aug 14, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2372022
    • Patent number 2,372,022
    • Issue date Mar 20, 1945
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2269692
    • Patent number 2,269,692
    • Issue date Jan 13, 1942
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2104971
    • Patent number 2,104,971
    • Issue date Jan 11, 1938
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE