Patents by Inventor Charles D. Throckmorton

Charles D. Throckmorton 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).

  • Dynamically stable pressure control system
    Patent number: 9127697
    Abstract: A hydraulic pressure control system having a variable displacement pump fluidly connected to a hydraulic motor. The pump provides flow to a first circuit upon demand. Remaining flow is provided to a second circuit. The second circuit includes a pilot controlled pressure reducing valve that adjusts the pumps outlet pressure based upon a sensed loads taken from a conduit between the pressure control valve and an active flow regulator valve.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: September 8, 2015
    Assignee: SAUER-DANFOSS INC.
    Inventors: Charles D. Throckmorton, Stephen D. Cromer, Glenn M. Mahony, Michael J. Stoltenow, Chad J. Daniel
  • Hydrostatic transmission having proportional pressure variable displacement pump for loop charge and fan flow supply
    Patent number: 8176734
    Abstract: A hydrostatic transmission having a hydraulic pump that is fluidly connected to a hydraulic motor. The transmission also has a pressure control valve that has first and second stages and is fluidly connected to the hydraulic pump. By utilizing the pressure control valve when the first stage of the pressure control is at a minimum pressure the second stage determines the minimum charge pressure setting for the hydrostatic transmission.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: May 15, 2012
    Assignee: Sauer-Danfoss Inc.
    Inventor: Charles D. Throckmorton
  • HYDROSTATIC TRANSMISSION HAVING PROPORTIONAL PRESSURE VARIABLE DISPLACEMENT PUMP FOR LOOP CHARGE AND FAN FLOW SUPPLY
    Publication number: 20100132352
    Abstract: A hydrostatic transmission having a hydraulic pump that is fluidly connected to a hydraulic motor. The transmission also has a pressure control valve that has first and second stages and is fluidly connected to the hydraulic pump. By utilizing the pressure control valve when the first stage of the pressure control is at a minimum pressure the second stage determines the minimum charge pressure setting for the hydrostatic transmission.
    Type: Application
    Filed: December 3, 2008
    Publication date: June 3, 2010
    Applicant: SAUER-DANFOSS INC.
    Inventor: Charles D. Throckmorton
  • Flow sharing priority circuit for open circuit systems with several actuators per pump
    Patent number: 6931847
    Abstract: A priority circuit is provided that is in communication with an open circuit pump and priority and auxiliary systems. The circuit comprises a first valve with an inlet in communication with the pump, an outlet in communication the priority system, and a load sensing inlet in communication with the priority system, wherein the first valve modulates to maintain a predetermined pressure differential between pressure at the load sensing inlet and pressure at the outlet. The circuit further comprises a second valve with an inlet in communication with the pump, an outlet in communication with the auxiliary system, and a load sensing inlet in communication with the priority system, wherein the second valve is normally closed and opens when pressure at the load sensing inlet of the second valve is less than pressure at the inlet of the second valve minus the predetermined pressure differential of the first valve.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: August 23, 2005
    Assignee: Sauer-Danfoss, Inc.
    Inventors: Charles D. Throckmorton, Michael D. Gandrud, Jimmy W. Bolinger