Patents by Inventor Richard M. Parrott

Richard M. Parrott 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: 4860794
    Abstract: A dual solenoid valve assembly is provided. The assembly includes a casing joined to a housing having a pressure inlet and outlet, an exhaust port, a first fluid path connecting the inlet and the outlet, and a second fluid path intersecting the first fluid path and connected with the exhaust port. A first valve seat is in the first fluid path and a second valve seat is in the second fluid path. A first solenoid coil is mounted within the casing and a first magnetic solenoid stop is mounted within the first coil. A first solenoid plunger is slidably mounted within the first coil biased away from the first valve seat. A first tubular valve stem is fixably connected with the first plunger for sealably contacting the first valve seat. A second solenoid coil is mounted within the casing on a side of the first coil opposite the housing. A second magnetic stop is mounted within the second coil and a second solenoid plunger is biased away from the stop and is slidably mounted within the second coil.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: August 29, 1989
    Assignee: General Motors Corporation
    Inventors: Richard M. Parrott, Jack A. Colvin, Lyle W. Shuey
  • Patent number: 4821770
    Abstract: A valve assembly having normally opened and normally closed valves controlled by solenoids to provide various connected and disconnected arrangements in a fluid system. It is particularly useful in a wheel lock control or anti-skid brake system (ABS).
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: April 18, 1989
    Assignee: General Motors Corporation
    Inventors: Richard M. Parrott, Yuchi P. Peng, William J. Ricketts