TREA

David R. Underdown

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  • Alvin, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Proppant charge and method
    • Patent number 4,664,819
    • Issue date May 12, 1987
    • Baker Oil Tools, Inc.
    • O. Howard Glaze
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Proppant charge and method
    • Patent number 4,564,459
    • Issue date Jan 14, 1986
    • Baker Oil Tools, Inc.
    • David R. Underdown
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Proppant charge and method
    • Patent number 4,443,347
    • Issue date Apr 17, 1984
    • Baker Oil Tools, Inc.
    • David R. Underdown
    • E21 - EARTH DRILLING MINING