TREA

Spencer L. Hermanson

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  • Mountain View, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    DTMF Signal receiver
    • Patent number 4,313,038
    • Issue date Jan 26, 1982
    • Wescom, Inc.
    • Albert G. Nilssen
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Telephone supervision system using DTMF signals
    • Patent number 4,219,699
    • Issue date Aug 26, 1980
    • Wescom, Inc.
    • Albert G. Nilssen
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE