TREA

DeWitt Paul Smith

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  • Naperville, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Telephone subscriber line circuit
    • Patent number 4,056,691
    • Issue date Nov 1, 1977
    • Bell Telephone Laboratories, Incorporated
    • Laimons Freimanis
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Telephone line battery feed circuit
    • Patent number 4,007,335
    • Issue date Feb 8, 1977
    • Bell Telephone Laboratories, Incorporated
    • Irvine Keers Hetherington
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE