TREA

Donald Stewart

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  • Near Inverness, Highland, GB
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Patents Grantslast 30 patents

  • Information Patent Grant

    Underwater excavation apparatus
    • Patent number 12,163,309
    • Issue date Dec 10, 2024
    • Rotech Group Limited
    • Donald Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Underwater excavation apparatus
    • Patent number 12,110,653
    • Issue date Oct 8, 2024
    • Rotech Group Limited
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Underwater excavation apparatus
    • Patent number 11,821,164
    • Issue date Nov 21, 2023
    • Rotech Holdings Limited
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Underwater excavation apparatus
    • Patent number 11,649,607
    • Issue date May 16, 2023
    • Rotech Holdings Limited
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Underwater excavation apparatus
    • Patent number 8,800,176
    • Issue date Aug 12, 2014
    • Rotech Limited
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Underwater excavation apparatus
    • Patent number 8,522,460
    • Issue date Sep 3, 2013
    • Rotech Holdings Limited
    • Donald Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Power generator and turbine unit
    • Patent number 7,944,073
    • Issue date May 17, 2011
    • Rotech Holdings Limited
    • Hector Fillipus Alexander Van Drentham Susman
    • F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
  • Information Patent Grant

    Power generator and turbine unit
    • Patent number 7,768,145
    • Issue date Aug 3, 2010
    • Rotech Holdings Limited
    • Hector Fillipus Alexander Van Drentham Susman
    • F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
  • Information Patent Grant

    Speed governor
    • Patent number 6,854,953
    • Issue date Feb 15, 2005
    • Rotech Holdings, Limited
    • Hector F. A. Van Drentham-Susman
    • E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

  • Information Patent Application

    Improvements In and Relating To Underwater Excavation Apparatus
    • Publication number 20250101710
    • Publication date Mar 27, 2025
    • Rotech Group Limited
    • Donald STEWART
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    CUTTING TOOL
    • Publication number 20240424582
    • Publication date Dec 26, 2024
    • Rotech Group Limited
    • Donald Stewart
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Application

    UNDERWATER EXCAVATION APPARATUS
    • Publication number 20230138350
    • Publication date May 4, 2023
    • Rotech Group Limited
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    UNDERWATER EXCAVATION APPARATUS
    • Publication number 20230045315
    • Publication date Feb 9, 2023
    • Rotech Group Limited
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    IMPROVEMENTS IN AND RELATING TO UNDERWATER EXCAVATION APPARATUS
    • Publication number 20210047800
    • Publication date Feb 18, 2021
    • Rotech Group Limited
    • Donald Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    IMPROVEMENTS IN AND RELATING TO UNDERWATER EXCAVATION APPARATUS
    • Publication number 20200407940
    • Publication date Dec 31, 2020
    • Rotech Group Limited
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    CUTTING TOOL
    • Publication number 20190134724
    • Publication date May 9, 2019
    • Rotech Group Limited
    • Donald Stewart
    • B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
  • Information Patent Application

    Improved Turbine
    • Publication number 20160102499
    • Publication date Apr 14, 2016
    • Kenneth Roderick Stewart
    • F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
  • Information Patent Application

    UNDERWATER EXCAVATION APPARATUS
    • Publication number 20110099859
    • Publication date May 5, 2011
    • Kenneth Roderick Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    UNDERWATER EXCAVATION APPARATUS
    • Publication number 20110056098
    • Publication date Mar 10, 2011
    • ROTECH HOLDINGS LIMITED
    • Donald Stewart
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    POWER GENERATOR AND TURBINE UNIT
    • Publication number 20100148513
    • Publication date Jun 17, 2010
    • Hector Filippus Alexander Van Drentham Susman
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    POWER GENERATOR AND TURBINE UNIT
    • Publication number 20090179425
    • Publication date Jul 16, 2009
    • Rotech Holdings Limited
    • Hector Fillipus Alexander Van Drentham Susman
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    Power generator and turbine unit
    • Publication number 20050001432
    • Publication date Jan 6, 2005
    • Hector Fillipus Alexander Van Drentham Susman
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    Speed governor
    • Publication number 20030029308
    • Publication date Feb 13, 2003
    • Hector F. A. Van Drentham-Susman
    • E21 - EARTH DRILLING MINING