Darrin Lynn Yenzer

Person

  • Cypress, TX, US

Patents Grantslast 30 patents

  • Information Patent Grant

    Top drive with shaft seal isolation

    • Patent number 7,748,445
    • Issue date Jul 6, 2010
    • National-Oilwell Varco, L.P.
    • Lawrence Edward Wells
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents