Patents by Inventor Christopher Pruess

Christopher Pruess 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).

  • Hydrostatic circuits with variable charge and variable flushing systems
    Patent number: 8833069
    Abstract: A closed hydrostatic circuit with variable charge and variable flushing systems is disclosed. A variable displacement charge pump is configured to supply charge fluid and pilot control fluid to the hydrostatic circuit. An electronically controlled pressure regulating valve is in communication with an output of the charge pump and is linked to a controller. When the hydrostatic control system detects a high hydraulic temperature condition, the electronically controlled pressure regulating valve, that is in communication with an output of the charge pump and that is linked to a controller, increases the charge pump flow. A bidirectional variable displacement hydrostatic motor is connected in parallel to two input/output lines. A flush valve is in communication with the hydrostatic motor and both input/output lines. The flush valve and hydrostatic motor are both in communication with the flush orifice and a flush relief valve.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: September 16, 2014
    Assignee: Caterpillar Inc.
    Inventors: Christopher J. Demick, Paul A. Dvorak, William Christopher Swick, Vincent Guyard, Christopher Mark Elliott, Christopher Pruess
  • Hydrostatic Circuits with Variable Charge and Variable Flushing Systems
    Publication number: 20120317964
    Abstract: A closed hydrostatic circuit with variable charge and variable flushing systems is disclosed. A variable displacement charge pump is configured to supply charge fluid and pilot control fluid to the hydrostatic circuit. An electronically controlled pressure regulating valve is in communication with an output of the charge pump and is linked to a controller. When the hydrostatic control system detects a high hydraulic temperature condition, the electronically controlled pressure regulating valve, that is in communication with an output of the charge pump and that is linked to a controller, increases the charge pump flow. A bidirectional variable displacement hydrostatic motor is connected in parallel to two input/output lines. A flush valve is in communication with the hydrostatic motor and both input/output lines. The flush valve and hydrostatic motor are both in communication with the flush orifice and a flush relief valve.
    Type: Application
    Filed: June 16, 2011
    Publication date: December 20, 2012
    Applicant: CATERPILLAR, INC.
    Inventors: Christopher J. Demick, Paul A. Dvorak, William Christopher Swick, Vincent Guyard, Christopher Mark Elliott, Christopher Pruess