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David S. Williams

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Patents Grantslast 30 patents

  • Information Patent Grant

    Button sharpening
    • Patent number 5,182,971
    • Issue date Feb 2, 1993
    • Boart International, Limited
    • David S. Williams
    • B24 - GRINDING POLISHING
  • Information Patent Grant

    Wire line core drilling apparatus
    • Patent number 5,020,612
    • Issue date Jun 4, 1991
    • Boart International Limited
    • David Stanley Williams
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Apparatus for positioning deflection wedges
    • Patent number 4,305,462
    • Issue date Dec 15, 1981
    • Boart International Limited
    • Wulf Eilers
    • E21 - EARTH DRILLING MINING