Patents by Inventor Nathan Harold French

Nathan Harold French has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Control valve assembly for electro-hydraulic steering system
    Patent number: 8651225
    Abstract: A steering system includes a fluid pump and an electro-hydraulic steering circuit in selective fluid communication with the fluid pump. The electro-hydraulic steering circuit defines a first flow path having a first proportional valve and a first load-sense passage in selective communication with the first proportional valve. The first proportional valve includes a closed position. A hydrostatic steering circuit is in selective fluid communication with the fluid pump and defines a second flow path having a second proportional valve and a second load-sense passage in selective fluid communication with the second proportional valve. The second flow path is in a parallel flow configuration with the first flow path. An isolation valve is disposed in the first flow path in series with the first proportional valve. The isolation valve includes a closed position and is piloted to the closed position by fluid communicated through the second load-sense passage.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: February 18, 2014
    Assignee: Eaton Corporation
    Inventors: John Michael Cadman, Nathan Harold French, Wade Leo Gehlhoff, Robin Francis Ireton
  • CONTROL VALVE ASSEMBLY FOR ELECTRO-HYDRAULIC STEERING SYSTEM
    Publication number: 20110284311
    Abstract: A steering system includes a fluid pump and an electro-hydraulic steering circuit in selective fluid communication with the fluid pump. The electro-hydraulic steering circuit defines a first flow path having a first proportional valve and a first load-sense passage in selective communication with the first proportional valve. The first proportional valve includes a closed position. A hydrostatic steering circuit is in selective fluid communication with the fluid pump and defines a second flow path having a second proportional valve and a second load-sense passage in selective fluid communication with the second proportional valve. The second flow path is in a parallel flow configuration with the first flow path. An isolation valve is disposed in the first flow path in series with the first proportional valve. The isolation valve includes a closed position and is piloted to the closed position by fluid communicated through the second load-sense passage.
    Type: Application
    Filed: July 26, 2011
    Publication date: November 24, 2011
    Applicant: Eaton Corporation
    Inventors: John Michael Cadman, Nathan Harold French, Wade Leo Gehlhoff, Robin Francis Ireton
  • Control valve assembly for electro-hydraulic steering system
    Patent number: 7984785
    Abstract: A steering system includes a fluid pump and an electro-hydraulic steering circuit in selective fluid communication with the fluid pump. The electro-hydraulic steering circuit defines a first flow path having a first proportional valve and a first load-sense passage in selective communication with the first proportional valve. The first proportional valve includes a closed position. A hydrostatic steering circuit is in selective fluid communication with the fluid pump and defines a second flow path having a second proportional valve and a second load-sense passage in selective fluid communication with the second proportional valve. The second flow path is in a parallel flow configuration with the first flow path. An isolation valve is disposed in the first flow path in series with the first proportional valve. The isolation valve includes a closed position and is piloted to the closed position by fluid communicated through the second load-sense passage.
    Type: Grant
    Filed: February 28, 2008
    Date of Patent: July 26, 2011
    Assignee: Eaton Corporation
    Inventors: John Michael Cadman, Nathan Harold French, Wade Leo Gehlhoff, Robin Francis Ireton
  • Control Valve Assembly for Electro-Hydraulic Steering System
    Publication number: 20090218161
    Abstract: A steering system includes a fluid pump and an electro-hydraulic steering circuit in selective fluid communication with the fluid pump. The electro-hydraulic steering circuit defines a first flow path having a first proportional valve and a first load-sense passage in selective communication with the first proportional valve. The first proportional valve includes a closed position. A hydrostatic steering circuit is in selective fluid communication with the fluid pump and defines a second flow path having a second proportional valve and a second load-sense passage in selective fluid communication with the second proportional valve. The second flow path is in a parallel flow configuration with the first flow path. An isolation valve is disposed in the first flow path in series with the first proportional valve. The isolation valve includes a closed position and is piloted to the closed position by fluid communicated through the second load-sense passage.
    Type: Application
    Filed: February 28, 2008
    Publication date: September 3, 2009
    Applicant: EATON CORPORATION
    Inventors: John Michael Cadman, Nathan Harold French, Wade Leo Gehlhoff, Robin Francis Ireton