Patents by Inventor Paul M. Heck

Paul M. Heck 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).

  • Sealing shroud port timing valve for two cycle engine
    Patent number: 4993373
    Abstract: An exhaust port timing valve for a two cycle engine has a sealing shroud preferably made as a flexible sheet that is urged by gas pressure into sealing contact with a slot and/or sealing edges of an associated exhaust port or shroud to allow low friction valve adjustment while limiting gas leakage past the valve unaffected by close tolerances and temperature changes. Springs and/or seals can alternatively be used with flexible or non-flexible shrouds to improve sealing.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: February 19, 1991
    Assignee: General Motors Corporation
    Inventors: Edward D. Klomp, Edward G. Groff, Donald T. French, Paul M. Heck