TREA

John Hayward

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  • Minchinhampton, GB
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Patents Grantslast 30 patents

  • Information Patent Grant

    Rotary drill bits
    • Patent number 6,092,613
    • Issue date Jul 25, 2000
    • Camco International (UK) Limited
    • Douglas Caraway
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits
    • Patent number 5,992,547
    • Issue date Nov 30, 1999
    • Camco International (UK) Limited
    • Douglas Caraway
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits
    • Patent number 5,967,246
    • Issue date Oct 19, 1999
    • Camco International (UK) Limited
    • Douglas Caraway
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits
    • Patent number 5,904,213
    • Issue date May 18, 1999
    • Camco International (UK) Limited
    • Douglas Caraway
    • E21 - EARTH DRILLING MINING