TREA

Michael Friedrichs

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  • Montgomery, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Drill string valve and method
    • Patent number 8,727,040
    • Issue date May 20, 2014
    • Hydril USA Distribution LLC
    • Derryl Schroeder
    • Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Information Patent Grant

    Drill string valve and method
    • Patent number 8,539,975
    • Issue date Sep 24, 2013
    • Hydril USA Manufacturing, LLC
    • Derryl Schroeder
    • Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC

Patents Applicationslast 30 patents

  • Information Patent Application

    Drill String Valve and Method
    • Publication number 20120103619
    • Publication date May 3, 2012
    • HYDRIL USA MANUFACTURING LLC
    • Derryl Schroeder
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Drill String Valve and Method
    • Publication number 20110100471
    • Publication date May 5, 2011
    • HYDRIL USA MANUFACTURING LLC
    • Derryl Schroeder
    • E21 - EARTH DRILLING MINING