TREA

Roy A. Fetterman JR.

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  • Fort Washington, PA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pressure equalizing check valve
    • Patent number 6,543,474
    • Issue date Apr 8, 2003
    • Roy A. Fetterman
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

  • Information Patent Application

    Pressure equalizing check valve
    • Publication number 20020170602
    • Publication date Nov 21, 2002
    • Roy A. Fetterman
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...