Patents by Inventor Robert D. Krehbiel

Robert D. Krehbiel 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).

  • Patent number: 4463563
    Abstract: An improved rephasing master cylinder in which the cylinder wall approximate the end of the cylinder has a longitudinal bleed passage in the cylinder wall at one end connected to a lateral passage opening into the forward cylinder chamber while the opposite end of the longitudinal passage connects with the rearward chamber of the cylinder when the cylinder piston is located therebetween. This longitudinal bleed passage permits the restricted flow past the master cylinder piston when the piston is nearing and at the end of its stroke, thereby causing both master and slave pistons to complete their respective strokes.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: August 7, 1984
    Assignee: The Cessna Aircraft Company
    Inventor: Robert D. Krehbiel
  • Patent number: 4037410
    Abstract: A hydraulic control valve in a closed-center load responsive system having a passage with a check valve therein downstream of the inlet metering and signal passage allowing flow from the signal passage to the load prior to connecting the pressure circuit to the load circuit so as to relieve fluid from the signal circuit to the load circuit as the signal circuit attains a pressure higher than the existing load thus causing flow past the inlet metering whereby the pressure differential in the metering compensates the pump.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: July 26, 1977
    Assignee: The Cessna Aircraft Company
    Inventors: Alan D. Jackson, Homer R. Graber, Robert D. Krehbiel