TREA

Charles T. Helpinstill II

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  • Houston, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Folding piano
    • Patent number 4,376,402
    • Issue date Mar 15, 1983
    • Charles T. Helpinstill
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Breakdown piano
    • Patent number 4,254,684
    • Issue date Mar 10, 1981
    • Charles T. Helpinstill
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Magnetic sensor for a musical instrument and method of constructing...
    • Patent number 4,212,220
    • Issue date Jul 15, 1980
    • Charles T. Helpinstill
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Guitar pick-up apparatus
    • Patent number 4,145,944
    • Issue date Mar 27, 1979
    • Charles T. Helpinstill
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS