Patents by Inventor Edward Frederick Willem

Edward Frederick Willem 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).

  • Patent number: 3955823
    Abstract: An oil ring assembly for internal combustion engine pistons including an annular split piston ring with an inner circumferential groove, a radially expandable split annular spring in the groove, and a bridging means in the groove spanning the gap between opposite ends of the piston ring. The spring is preferably a coil spring and the bridging means is preferably a cylindrical arcuate segment located between opposite ends of the spring with pins on each end extending inside the coils of the spring. Alternatively, the arcuate segment may be formed from a tightly wound coil spring. A second enbodiment utilizes a serpentine expander as the spring and the bridging means comprises a flat arcuate segment located in a notch in the expander adjacent the gap in the piston ring.
    Type: Grant
    Filed: November 19, 1974
    Date of Patent: May 11, 1976
    Assignee: Koppers Company, Inc.
    Inventor: Edward Frederick Willem