TREA

Ronald J. Maginley

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  • Ann Arbor, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Digital key telephone system
    • Patent number 5,027,345
    • Issue date Jun 25, 1991
    • Northern Telecom Limited
    • Timothy J. Littlewood
    • 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
  • Information Patent Grant

    Digital key telephone system
    • Patent number 4,873,682
    • Issue date Oct 10, 1989
    • Northern Telecom Limited
    • George F. Irwin
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE