TREA

Roy J. HARTFIELD, JR.

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  • Auburn, AL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Positive displacement rotary vane engine
    • Patent number 8,037,863
    • Issue date Oct 18, 2011
    • Roy J. Hartfield, Jr.
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...

Patents Applicationslast 30 patents

  • Information Patent Application

    POSITIVE DISPLACEMENT ROTARY VANE ENGINE
    • Publication number 20120000199
    • Publication date Jan 5, 2012
    • Roy J. HARTFIELD, JR.
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES