TREA

David Coull

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  • Angus, GB
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Patents Grantslast 30 patents

  • Information Patent Grant

    Rotary steerable drilling apparatus
    • Patent number 9,500,031
    • Issue date Nov 22, 2016
    • APS Technology, Inc.
    • David A. Coull
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Downhole tractor
    • Patent number 9,004,194
    • Issue date Apr 14, 2015
    • National-Oilwell Varco, L.P.
    • Alan Martyn Eddison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Selective agitation
    • Patent number 8,167,051
    • Issue date May 1, 2012
    • National-Oilwell Varco, L.P.
    • Alan Martyn Eddison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Shut-in tool
    • Patent number 4,964,460
    • Issue date Oct 23, 1990
    • Eljay Well Services Limited
    • Richard A. Armell
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    ROTARY STEERABLE DRILLING APPARATUS
    • Publication number 20140131106
    • Publication date May 15, 2014
    • David A. Coull
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    DOWNHOLE TRACTOR
    • Publication number 20120279724
    • Publication date Nov 8, 2012
    • NATIONAL OILWELL VARCO. L.P.
    • Alan Martyn Eddison
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    Selective Agitation
    • Publication number 20090223676
    • Publication date Sep 10, 2009
    • Alan Martyn Eddison
    • E21 - EARTH DRILLING MINING