Patents by Inventor Stefan P. Whitelaw

Stefan P. Whitelaw 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).

  • Plastic valve core
    Patent number: 4275756
    Abstract: A valve core or insides for a valve device, said core being made primarily of plastic such that its manufacturing costs are considerably reduced, the core being specially configured to allow for substantial air flow through the core while insuring good dynamic sealing.
    Type: Grant
    Filed: July 2, 1980
    Date of Patent: June 30, 1981
    Assignee: National Distillers and Chemical Corporation
    Inventors: Rodney J. Cairns, Stefan P. Whitelaw