Patents by Inventor Jurgen Doench

Jurgen Doench 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).

  • Shock absorber piston
    Patent number: 4830152
    Abstract: The invention relates to shock-absorber pistons which have a piston body mountable on a piston shaft, the piston body having on both faces a circumferential chamber and these chambers being covered by valve spring disks which rest on circumferential shoulders around the circumferential chambers. The piston body has counterflow channels each leading from the circumferential chamber on one face to an aperture outside the circumferential shoulder on the opposite face.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: May 16, 1989
    Assignee: August Bilstein GmbH & Co.
    Inventors: Max-Otto Rauert, Heinrich Sporenberg, Jurgen Doench, Ewald May