TREA

Signalling by amplitude or polarity of dc

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  • CPC
  • H04Q5/06
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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

H04Q5/06Signalling by amplitude or polarity of dc
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Patents Grantslast 30 patents

  • Information Patent Grant

    3916111
    • Patent number 3,916,111
    • Issue date Oct 28, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3526721
    • Patent number 3,526,721
    • Issue date Sep 1, 1970
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3382322
    • Patent number 3,382,322
    • Issue date May 7, 1968
    • G08 - SIGNALLING
  • Information Patent Grant

    3035123
    • Patent number 3,035,123
    • Issue date May 15, 1962
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2999901
    • Patent number 2,999,901
    • Issue date Sep 12, 1961
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2790851
    • Patent number 2,790,851
    • Issue date Apr 30, 1957
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2788394
    • Patent number 2,788,394
    • Issue date Apr 9, 1957
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2691070
    • Patent number 2,691,070
    • Issue date Oct 5, 1954
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2691071
    • Patent number 2,691,071
    • Issue date Oct 5, 1954
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2641653
    • Patent number 2,641,653
    • Issue date Jun 9, 1953
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2490054
    • Patent number 2,490,054
    • Issue date Dec 6, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2414123
    • Patent number 2,414,123
    • Issue date Jan 14, 1947
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2396072
    • Patent number 2,396,072
    • Issue date Mar 5, 1946
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2323692
    • Patent number 2,323,692
    • Issue date Jul 6, 1943
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2268880
    • Patent number 2,268,880
    • Issue date Jan 6, 1942
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2261620
    • Patent number 2,261,620
    • Issue date Nov 4, 1941
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2250770
    • Patent number 2,250,770
    • Issue date Jul 29, 1941
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2236798
    • Patent number 2,236,798
    • Issue date Apr 1, 1941
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2224497
    • Patent number 2,224,497
    • Issue date Dec 10, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2224517
    • Patent number 2,224,517
    • Issue date Dec 10, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2206538
    • Patent number 2,206,538
    • Issue date Jul 2, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2188520
    • Patent number 2,188,520
    • Issue date Jan 30, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2186315
    • Patent number 2,186,315
    • Issue date Jan 9, 1940
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2176321
    • Patent number 2,176,321
    • Issue date Oct 17, 1939
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2088311
    • Patent number 2,088,311
    • Issue date Jul 27, 1937
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1986921
    • Patent number 1,986,921
    • Issue date Jan 8, 1935
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1889466
    • Patent number 1,889,466
    • Issue date Nov 29, 1932
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1865200
    • Patent number 1,865,200
    • Issue date Jun 28, 1932
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1778768
    • Patent number 1,778,768
    • Issue date Oct 21, 1930
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    1749838
    • Patent number 1,749,838
    • Issue date Mar 11, 1930
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents