TREA

with an additional signal transmitted for voice protection

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  • CPC
  • H04Q1/4535
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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

H04Q1/4535with an additional signal transmitted for voice protection
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    Guard tone capture method
    • Patent number 4,554,542
    • Issue date Nov 19, 1985
    • Motorola, Inc.
    • Arman V. Dolikian
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Apparatus for detecting in-band signalling signals
    • Patent number 4,169,969
    • Issue date Oct 2, 1979
    • Societe Lignes Telegraphiques et Telephoniques
    • Jacques Bessard
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Telecommunication system with keyboard selection
    • Patent number 4,130,736
    • Issue date Dec 19, 1978
    • Societa Italiana Telecomunicazioni Siemens S.p.A.
    • Franco De Marco
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3828141
    • Patent number 3,828,141
    • Issue date Aug 6, 1974
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3649771
    • Patent number 3,649,771
    • Issue date Mar 14, 1972
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3330913
    • Patent number 3,330,913
    • Issue date Jul 11, 1967
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3270144
    • Patent number 3,270,144
    • Issue date Aug 30, 1966
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3209076
    • Patent number 3,209,076
    • Issue date Sep 28, 1965
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3201524
    • Patent number 3,201,524
    • Issue date Aug 17, 1965
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3200205
    • Patent number 3,200,205
    • Issue date Aug 10, 1965
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3187109
    • Patent number 3,187,109
    • Issue date Jun 1, 1965
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2733299
    • Patent number 2,733,299
    • Issue date Jan 31, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2651642
    • Patent number 2,651,642
    • Issue date Sep 8, 1953
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2651684
    • Patent number 2,651,684
    • Issue date Sep 8, 1953
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2593512
    • Patent number 2,593,512
    • Issue date Apr 22, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2410149
    • Patent number 2,410,149
    • Issue date Oct 29, 1946
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2376352
    • Patent number 2,376,352
    • Issue date May 22, 1945
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2356330
    • Patent number 2,356,330
    • Issue date Aug 22, 1944
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2319339
    • Patent number 2,319,339
    • Issue date May 18, 1943
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2299821
    • Patent number 2,299,821
    • Issue date Oct 27, 1942
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2299822
    • Patent number 2,299,822
    • Issue date Oct 27, 1942
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE