TREA

John W. J. Williams

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  • Kanata, CA
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Patents Grantslast 30 patents

  • Information Patent Grant

    Digital key telephone system
    • Patent number 5,136,585
    • Issue date Aug 4, 1992
    • Northern Telecom Limited
    • Nadir Nizamuddin
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Digital key telephone system
    • Patent number 4,893,310
    • Issue date Jan 9, 1990
    • Northern Telecom Limited
    • David J. Robertson
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE