Patents by Inventor Donald K. Spring

Donald K. Spring 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).

  • Cushion stop for hydraulic cylinder
    Patent number: 4397218
    Abstract: A cushioning device for decelerating and stopping the piston in a hydraulic cylinder by restricting and throttling the fluid flow from the cylinder.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: August 9, 1983
    Assignee: Allis-Chalmers Corporation
    Inventor: Donald K. Spring