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 8,567,178
    • Issue date Oct 29, 2013
    • Roy J. Hartfield
    • 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 20140020384
    • Publication date Jan 23, 2014
    • Roy J. HARTFIELD
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    POSITIVE DISPLACEMENT ROTARY VANE ENGINE
    • Publication number 20080216792
    • Publication date Sep 11, 2008
    • Roy J. HARTFIELD
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES