Patents by Inventor Joshua D Graeve

Joshua D Graeve 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).

  • HYDRAULIC SYSTEM WITH WARM UP CIRCUIT
    Publication number: 20090139395
    Abstract: A hydraulic control system in which a pump for pressurized hydraulic fluid connects with a valve assembly having a valve element displaceable in a chamber to selectively direct fluid to a load driven by the hydraulic system. Surfaces on the end faces of the valve element are exposed to hydraulic pressure from a controller via electro-hydraulic solenoid valves. The surfaces of the valve element adjacent the end faces are undercut to establish a leakage flow path and the solenoid valves are selectively actuated to pressurize the end faces to a level below normal actuation of the valve element but high enough to cause fluid to return to a drain and thus increase the temperature of the hydraulic fluid in the system.
    Type: Application
    Filed: December 3, 2007
    Publication date: June 4, 2009
    Inventors: Edward C. Messerlie, Neil V. Harber, Joshua D. Graeve
  • Control system for an electronic float feature for a loader
    Patent number: 7478489
    Abstract: The present invention is related to a loader of a construction apparatus such as front-end wheel loader or an agricultural tractor. Specifically, the present invention is related to a control system for a loader.
    Type: Grant
    Filed: June 1, 2006
    Date of Patent: January 20, 2009
    Assignee: Deere & Company
    Inventors: Eric R Anderson, Jahmy Hindman, Joshua D Graeve
  • Steering system with variable flow rate amplification ratio and associated method
    Publication number: 20080116001
    Abstract: A steering system has a steering control unit and a ratio adjuster for varying a flow rate amplification ratio of the steering control unit.
    Type: Application
    Filed: October 30, 2006
    Publication date: May 22, 2008
    Inventors: Joshua D. Graeve, Eric R. Anderson
  • Control system for an electronic float feature for a loader
    Publication number: 20070277405
    Abstract: The present invention is related to a loader of a construction apparatus such as front-end wheel loader or an agricultural tractor. Specifically, the present invention is related to a control system for a loader.
    Type: Application
    Filed: June 1, 2006
    Publication date: December 6, 2007
    Inventors: Eric R. Anderson, Jahmy Hindman, Joshua D. Graeve