TREA

Douglas A. Hahn

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  • Geneva, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pro-active billing and routing test set
    • Patent number 5,369,680
    • Issue date Nov 29, 1994
    • Illinois Bell Telephone Company
    • William F. Borbas
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Programmable automatic call-thru set
    • Patent number 4,937,850
    • Issue date Jun 26, 1990
    • Illinois Bell Telephone Company
    • William F. Borbas
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE