TREA

David A. Whitley

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  • Brea, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Blind shaft drilling
    • Patent number 4,516,633
    • Issue date May 14, 1985
    • Santa Fe International Corporation
    • Paul Richardson
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Mine shaft liner
    • Patent number 4,460,293
    • Issue date Jul 17, 1984
    • Santa Fe International Corporation
    • Paul Richardson
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    Bore hole mining
    • Patent number 4,330,155
    • Issue date May 18, 1982
    • Santa Fe International Corporation
    • Paul Richardson
    • E21 - EARTH DRILLING MINING