TREA

David A. Theisen

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  • Hampstead, NC, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Sound conditioner
    • Patent number D347008
    • Issue date May 17, 1994
    • Marpac Corporation
    • David A. Theisen
    • D14 - Recording, communication, or information retrieval equipment
  • Information Patent Grant

    Synthesized telephone call announcer
    • Patent number D335129
    • Issue date Apr 27, 1993
    • Marpac Corporation
    • David A. Theisen
    • D14 - Recording, communication, or information retrieval equipment
  • Information Patent Grant

    Sound conditioner for masking intruding noises
    • Patent number D311065
    • Issue date Oct 2, 1990
    • Marpac Corporation
    • David A. Theisen
    • D24 - Medical and laboratory equipment