TREA

Henry D. Jeffries Jr.

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  • Naperville, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Ground fault and fire detector system
    • Patent number RE31147
    • Issue date Feb 8, 1983
    • Avtec Industries, Inc.
    • William F. Helwig
    • 361 - Electricity: electrical systems and devices
  • Information Patent Grant

    Ground fault and fire detector system
    • Patent number 4,163,269
    • Issue date Jul 31, 1979
    • Avtec Industries, Inc.
    • William F. Helwig
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER