Patents by Inventor Steven C. Hawthorne

Steven C. Hawthorne 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).

  • Cushioned hydraulic cylinder
    Publication number: 20040035288
    Abstract: A cushioned hydraulic cylinder which includes a check valve in the cushioning path to allow fast opposite direction movement. The check valve is in the form of a cast iron piston ring located within a groove in the piston which blocks unrestricted flow across the piston when the piston ring is seated against one side face of the groove and opens unrestricted flow when the piston ring abuts the opposite side face of the groove when the piston is moving in the opposite direction.
    Type: Application
    Filed: August 26, 2002
    Publication date: February 26, 2004
    Applicant: CROSS MANUFACTURING, INC.
    Inventor: Steven C. Hawthorne