TREA

Donald M. Townsend

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  • Mill Valley, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Gas appliance connection
    • Patent number 5,165,732
    • Issue date Nov 24, 1992
    • Simpson Dura Vent Company, Inc.
    • Donald M. Townsend
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Chimney liner system
    • Patent number 4,846,147
    • Issue date Jul 11, 1989
    • Simpson Dura-Vent Company, Inc.
    • Donald M. Townsend
    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
  • Information Patent Grant

    Thermally balanced air flow chimney
    • Patent number 4,608,963
    • Issue date Sep 2, 1986
    • Simpson Dura-Vent Company, Inc.
    • Donald M. Townsend
    • F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES