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Sidney Dantuma JOHNSTON

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  • Aberdeenshire, GB
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Patents Grantslast 30 patents

  • Information Patent Grant

    Tool for severing a downhole tubular by a stream of combustion prod...
    • Patent number 12,297,709
    • Issue date May 13, 2025
    • SPEX CORPORATE HOLDINGS LTD.
    • Sidney Dantuma Johnston
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Downhole tool with a propellant charge
    • Patent number 11,359,450
    • Issue date Jun 14, 2022
    • SPEX CORPORATE HOLDINGS LIMITED
    • Jamie Oag
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Cutting tool
    • Patent number 11,332,993
    • Issue date May 17, 2022
    • SPEX CORPORATE HOLDINGS LIMITED
    • Jamie Oag
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Downhole tool with a propellant charge
    • Patent number 10,954,734
    • Issue date Mar 23, 2021
    • SPEX CORPORATE HOLDINGS LIMITED
    • Jamie Oag
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Downhole tool with a propellant charge
    • Patent number 10,683,720
    • Issue date Jun 16, 2020
    • SPEX CORPORATE HOLDINGS LIMITED
    • Jamie Oag
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Cutting tool
    • Patent number 10,550,656
    • Issue date Feb 4, 2020
    • SPEX CORPORATE HOLDINGS LIMITED
    • Jamie Oag
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Downhole tool with a propellant charge
    • Patent number 10,041,321
    • Issue date Aug 7, 2018
    • SPEX CORPORATE HOLDINGS LIMITED
    • Jamie Oag
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR

Patents Applicationslast 30 patents

  • Information Patent Application

    DOWNHOLE TOOL WITH A PROPELLANT CHARGE
    • Publication number 20210032949
    • Publication date Feb 4, 2021
    • SPEX Corporate Holdings Limited
    • Jamie Oag
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Application

    TOOL WITH PROPELLANT SECTIONS
    • Publication number 20200284114
    • Publication date Sep 10, 2020
    • Nadir MAHJOUB
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    CUTTING TOOL
    • Publication number 20200131876
    • Publication date Apr 30, 2020
    • SPEX Engineering (UK) Limited
    • Jamie Oag
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    TOOL FOR SEVERING A DOWNHOLE TUBULAR BY A STREAM OF COMBUSTION PROD...
    • Publication number 20190284892
    • Publication date Sep 19, 2019
    • SPEX Corporate Holdings Ltd.
    • Sidney Dantuma JOHNSTON
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    DOWNHOLE TOOL WITH A PROPELLANT CHARGE
    • Publication number 20180340390
    • Publication date Nov 29, 2018
    • SPEX Corporate Holdings Limited
    • Jamie Oag
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Application

    CUTTING TOOL
    • Publication number 20180291697
    • Publication date Oct 11, 2018
    • SPEX Engineering (UK) Limited
    • Jamie OAG
    • E21 - EARTH DRILLING MINING
  • Information Patent Application

    DOWNHOLE TOOL WITH A PROPELLANT CHARGE
    • Publication number 20180163496
    • Publication date Jun 14, 2018
    • SPEX Engineering (UK) Limited
    • Jamie OAG
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR