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  • CPC
  • H04M3/326
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Parent Industries

HELECTRICITY H04Electric communication H04MTELEPHONIC COMMUNICATION H04M3/00Automatic or semi-automatic exchanges

Current Industry

H04M3/326for registers and translators
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Systems and methods for facilitating placement of telecommunication...
    • Patent number 7,359,490
    • Issue date Apr 15, 2008
    • AT&T Delaware Intellectual Property, Inc.
    • Robert H. Wright
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Systems and methods for facilitating placement of telecommunication...
    • Patent number 7,203,284
    • Issue date Apr 10, 2007
    • BellSouth Intellectual Property Corporation
    • Robert H. Wright
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    DTMF receiver sense and control maintenance arrangement
    • Patent number 4,621,354
    • Issue date Nov 4, 1986
    • GTE Communication Systems Corporation
    • Leo V. Jones
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Short circuit indicator for a terminator matrix
    • Patent number 4,045,623
    • Issue date Aug 30, 1977
    • Luis Albert Arce
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3898395
    • Patent number 3,898,395
    • Issue date Aug 5, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3863034
    • Patent number 3,863,034
    • Issue date Jan 28, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3863032
    • Patent number 3,863,032
    • Issue date Jan 28, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3634633
    • Patent number 3,634,633
    • Issue date Jan 11, 1972
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3446921
    • Patent number 3,446,921
    • Issue date May 27, 1969
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3059067
    • Patent number 3,059,067
    • Issue date Oct 16, 1962
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2991335
    • Patent number 2,991,335
    • Issue date Jul 4, 1961
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2862072
    • Patent number 2,862,072
    • Issue date Nov 25, 1958
    • G01 - MEASURING TESTING
  • Information Patent Grant

    2599409
    • Patent number 2,599,409
    • Issue date Jun 3, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2358267
    • Patent number 2,358,267
    • Issue date Sep 12, 1944
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2225688
    • Patent number 2,225,688
    • Issue date Dec 24, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2004607
    • Patent number 2,004,607
    • Issue date Jun 11, 1935
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1958635
    • Patent number 1,958,635
    • Issue date May 15, 1934
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1795349
    • Patent number 1,795,349
    • Issue date Mar 10, 1931
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1780910
    • Patent number 1,780,910
    • Issue date Nov 11, 1930
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1745039
    • Patent number 1,745,039
    • Issue date Jan 28, 1930
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1745040
    • Patent number 1,745,040
    • Issue date Jan 28, 1930
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1733617
    • Patent number 1,733,617
    • Issue date Oct 29, 1929
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1679316
    • Patent number 1,679,316
    • Issue date Jul 31, 1928
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1677957
    • Patent number 1,677,957
    • Issue date Jul 24, 1928
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1334766
    • Patent number 1,334,766
    • Issue date Mar 23, 1920
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents