Patents by Inventor Richard K. Donoghue

Richard K. Donoghue 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).

  • Low mass direct acting hydraulic valve lifter
    Patent number: 5230308
    Abstract: A direct acting hydraulic valve lifter features in a preferred embodiment a follower assembled with a thin wall metal shell and a light plastic baffle to support a lash adjusting hydraulic element assembly. An inlet riser chamber has sufficient cross section to minimize oil flow restriction in cold oil conditions. Dead space between the shell and baffle is filled with a strong lightweight foam to support and retain the baffle and displace oil for low mass.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: July 27, 1993
    Assignee: General Motors Corporation
    Inventors: Daniel G. Gauthier, Donald G. Engel, John J. Krieg, Michael J. Warden, Werner Herrmann, Richard K. Donoghue, Gary J. De Angelis