TREA

with granular resistance material

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  • CPC
  • H04R21/021
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HELECTRICITY H04Electric communication H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS H04R21/00Variable-resistance transducers

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H04R21/021with granular resistance material
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Patents Grantslast 30 patents

  • Information Patent Grant

    Microphone
    • Patent number 4,142,074
    • Issue date Feb 27, 1979
    • The United States of America as represented by the Attorney General of the Un...
    • Charles K. Corbett
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3859478
    • Patent number 3,859,478
    • Issue date Jan 7, 1975
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3845251
    • Patent number 3,845,251
    • Issue date Oct 29, 1974
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3835266
    • Patent number 3,835,266
    • Issue date Sep 10, 1974
    • C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
  • Information Patent Grant

    3825686
    • Patent number 3,825,686
    • Issue date Jul 23, 1974
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3816108
    • Patent number 3,816,108
    • Issue date Jun 11, 1974
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3437764
    • Patent number 3,437,764
    • Issue date Apr 8, 1969
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3277247
    • Patent number 3,277,247
    • Issue date Oct 4, 1966
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3103559
    • Patent number 3,103,559
    • Issue date Sep 10, 1963
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    3064089
    • Patent number 3,064,089
    • Issue date Nov 13, 1962
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2967914
    • Patent number 2,967,914
    • Issue date Jan 10, 1961
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2960579
    • Patent number 2,960,579
    • Issue date Nov 15, 1960
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2819351
    • Patent number 2,819,351
    • Issue date Jan 7, 1958
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2748882
    • Patent number 2,748,882
    • Issue date Jun 5, 1956
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2697136
    • Patent number 2,697,136
    • Issue date Dec 14, 1954
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2609458
    • Patent number 2,609,458
    • Issue date Sep 2, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2607859
    • Patent number 2,607,859
    • Issue date Aug 19, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2583732
    • Patent number 2,583,732
    • Issue date Jan 29, 1952
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2572525
    • Patent number 2,572,525
    • Issue date Oct 23, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2567368
    • Patent number 2,567,368
    • Issue date Sep 11, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2562526
    • Patent number 2,562,526
    • Issue date Jul 31, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2539488
    • Patent number 2,539,488
    • Issue date Jan 30, 1951
    • G01 - MEASURING TESTING
  • Information Patent Grant

    2538026
    • Patent number 2,538,026
    • Issue date Jan 16, 1951
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2532694
    • Patent number 2,532,694
    • Issue date Dec 5, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2532741
    • Patent number 2,532,741
    • Issue date Dec 5, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2527159
    • Patent number 2,527,159
    • Issue date Oct 24, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2521744
    • Patent number 2,521,744
    • Issue date Sep 12, 1950
    • G01 - MEASURING TESTING
  • Information Patent Grant

    2494704
    • Patent number 2,494,704
    • Issue date Jan 17, 1950
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2483317
    • Patent number 2,483,317
    • Issue date Sep 27, 1949
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    2435920
    • Patent number 2,435,920
    • Issue date Feb 10, 1948
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE