Patents by Inventor Michael Anthony A'Hearn

Michael Anthony A'Hearn 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).

  • Pressure-compensated hydraulic circuit with regeneration
    Patent number: 6761027
    Abstract: A fluid system includes first and second control valves that control fluid communication with first and second actuators. The first control valve may combine fluid flow from a second end port of the first actuator with fluid flow from a pressurized fluid source when providing a supply of fluid to a first end port of the first actuator. The first and second control valves include first and second signal ports in fluid communication with the supply of fluid to the first and second actuators. A resolver outputs a resolved signal pressure equal to the greater of a first signal pressure output by the first signal port and a second signal pressure output by the second signal port. A compensator in fluid communication with the first control valve and the first actuator controls fluid flow from the first control valve to the first actuator based on the resolved signal pressure.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: July 13, 2004
    Assignee: Caterpillar Inc
    Inventors: Michael Anthony A'Hearn, Daniel J. Mather, Srikrishnan Tirumalai Kumara Tolappa
  • Pressure-Compensated hydraulic circuit with regeneration
    Publication number: 20040000228
    Abstract: A fluid system includes first and second control valves that control fluid communication with first and second actuators. The first control valve may combine fluid flow from a second end port of the first actuator with fluid flow from a pressurized fluid source when providing a supply of fluid to a first end port of the first actuator. The first and second control valves include first and second signal ports in fluid communication with the supply of fluid to the first and second actuators. A resolver outputs a resolved signal pressure equal to the greater of a first signal pressure output by the first signal port and a second signal pressure output by the second signal port. A compensator in fluid communication with the first control valve and the first actuator controls fluid flow from the first control valve to the first actuator based on the resolved signal pressure.
    Type: Application
    Filed: June 27, 2002
    Publication date: January 1, 2004
    Applicant: Caterpillar Inc.
    Inventors: Michael Anthony A'Hearn, Daniel T. Mather, Srikrishnan Tirumalai Kumara Tolappa, Rangamani Srikrishnan