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Harold L. Rothi

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  • Otsego, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Buoyancy pump power system
    • Patent number 7,952,218
    • Issue date May 31, 2011
    • Independent Natural Resources, Inc.
    • Kenneth W. Welch, Jr.
    • F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
  • Information Patent Grant

    Buoyancy pump power system
    • Patent number 7,737,572
    • Issue date Jun 15, 2010
    • Independent Natural Resources, Inc.
    • Kenneth W. Welch, Jr.
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Buoyancy pump power system
    • Patent number 7,584,609
    • Issue date Sep 8, 2009
    • Independent Natural Resources, Inc.
    • Kenneth W. Welch, Jr.
    • F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
  • Information Patent Grant

    Buoyancy pump power system
    • Patent number 7,331,174
    • Issue date Feb 19, 2008
    • Independent Natural Resources, Inc.
    • Kenneth W. Welch, Jr.
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Buoyancy pump device
    • Patent number 7,258,532
    • Issue date Aug 21, 2007
    • Indepedent Natural Resources, Inc.
    • Kenneth W. Welch, Jr.
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Buoyancy pump power system
    • Patent number 7,059,123
    • Issue date Jun 13, 2006
    • Independent Natural Resources, Inc.
    • Kenneth W. Welch, Jr.
    • F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
  • Information Patent Grant

    Buoyancy pump device
    • Patent number 6,953,328
    • Issue date Oct 11, 2005
    • Independent Natural Resources, Inc.
    • Kenneth W. Welch, Jr.
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...

Patents Applicationslast 30 patents

  • Information Patent Application

    BUOYANCY PUMP POWER SYSTEM
    • Publication number 20110225964
    • Publication date Sep 22, 2011
    • KENNETH W. WELCH, JR.
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    BUOYANCY PUMP POWER SYSTEM
    • Publication number 20100215518
    • Publication date Aug 26, 2010
    • KENNETH W. WELCH, JR.
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    Buoyancy pump power system
    • Publication number 20080265581
    • Publication date Oct 30, 2008
    • Kenneth W. Welch
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    Buoyancy pump device
    • Publication number 20080101963
    • Publication date May 1, 2008
    • Kenneth W. Welch
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Buoyancy pump power system
    • Publication number 20060233613
    • Publication date Oct 19, 2006
    • Kenneth W. Welch
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Application

    Buoyancy pump power system
    • Publication number 20060230750
    • Publication date Oct 19, 2006
    • Kenneth W. Welch
    • F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
  • Information Patent Application

    Buoyancy pump device
    • Publication number 20050169774
    • Publication date Aug 4, 2005
    • Kenneth W. Welch
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Application

    Buoyancy pump power system
    • Publication number 20040131479
    • Publication date Jul 8, 2004
    • Kenneth W. Welch
    • F05 - INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF...
  • Information Patent Application

    Buoyancy pump device
    • Publication number 20040071565
    • Publication date Apr 15, 2004
    • Kenneth W. Welch
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...