TREA

NL Petroleum Products Limited

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  • London, GB
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Patents Grantslast 30 patents

  • Information Patent Grant

    Cutting elements for rotary drill bits
    • Patent number 4,928,777
    • Issue date May 29, 1990
    • NL Petroleum Products Limited
    • David N. Shirley-Fisher
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,823,892
    • Issue date Apr 25, 1989
    • NL Petroleum Products Limited
    • John Fuller
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,804,049
    • Issue date Feb 14, 1989
    • NL Petroleum Products Limited
    • John D. Barr
    • B22 - CASTING POWDER METALLURGY
  • Information Patent Grant

    Rotary drill bits for use in coring holes in subsurface formations
    • Patent number 4,790,396
    • Issue date Dec 13, 1988
    • NL Petroleum Products Limited
    • John Fuller
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Cutting structures for rotary drill bits
    • Patent number 4,781,256
    • Issue date Nov 1, 1988
    • NL Petroleum Products Limited
    • Michael T. Wardley
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,762,028
    • Issue date Aug 9, 1988
    • NL Petroleum Products Limited
    • Michael C. Regan
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,733,735
    • Issue date Mar 29, 1988
    • NL Petroleum Products Limited
    • John D. Barr
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,720,371
    • Issue date Jan 19, 1988
    • NL Petroleum Products Limited
    • David Shirley
    • B22 - CASTING POWDER METALLURGY
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,718,505
    • Issue date Jan 12, 1988
    • NL Petroleum Products Limited
    • John Fuller
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Cutter assemblies for rotary drill bits
    • Patent number 4,705,122
    • Issue date Nov 10, 1987
    • NL Petroleum Products Limited
    • Michael T. Wardley
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,700,790
    • Issue date Oct 20, 1987
    • NL Petroleum Products Limited
    • David Shirley
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method of forming cutting structures for rotary drill bits
    • Patent number 4,699,227
    • Issue date Oct 13, 1987
    • NL Petroleum Products Limited
    • Michael T. Wardley
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,697,654
    • Issue date Oct 6, 1987
    • NL Petroleum Products Limited
    • John D. Barr
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits with nozzle former and method of manufacturing
    • Patent number 4,694,919
    • Issue date Sep 22, 1987
    • NL Petroleum Products Limited
    • John D. Barr
    • B22 - CASTING POWDER METALLURGY
  • Information Patent Grant

    Rotary drill bits and cutting elements for such bits
    • Patent number 4,679,639
    • Issue date Jul 14, 1987
    • NL Petroleum Products Limited
    • John D. Barr
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Manufacture of rotary drill bits
    • Patent number 4,669,522
    • Issue date Jun 2, 1987
    • NL Petroleum Products Limited
    • Nigel D. Griffin
    • B22 - CASTING POWDER METALLURGY
  • Information Patent Grant

    Manufacture of rotary drill bits
    • Patent number 4,624,830
    • Issue date Nov 25, 1986
    • NL Petroleum Products, Limited
    • John D. Barr
    • B22 - CASTING POWDER METALLURGY
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,596,296
    • Issue date Jun 24, 1986
    • NL Petroleum Products Limited
    • Terry R. Matthias
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary drill bits
    • Patent number 4,577,706
    • Issue date Mar 25, 1986
    • NL Petroleum Products Limited
    • John D. Barr
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

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