Patents by Inventor Donald D. Stoltman

Donald D. Stoltman 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).

  • Control valve
    Patent number: 3958604
    Abstract: A hydraulic position servo system includes a primary control valve moved by a mechanical input which embodies a pintle laterally shiftable in a cylinder to differentially throttle two orifices to establish a variable control pressure.
    Type: Grant
    Filed: January 14, 1974
    Date of Patent: May 25, 1976
    Assignee: General Motors Corporation
    Inventor: Donald D. Stoltman