Patents by Inventor Erwin Knoll

Erwin Knoll 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).

  • Valve guidance for an exhaust gas valve of an internal combustion engine
    Patent number: 4798181
    Abstract: A valve guidance for an exhaust gas valve in the form of a disk valve of an internal combustion engine which is used for the control of an exhaust gas channel of an internal combustion engine; a guide body with good heat-conducting and sliding properties serves as valve guidance. The guide body is coated at the inlet place of the valve stem either with a hard metal coating applied by plasma-spray process or with a hard metal sleeve.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: January 17, 1989
    Assignee: Dr. Ing. h.c.f. Porsche Aktiengesellschaft
    Inventors: Michael Beer, August Hofbauer, Erwin Knoll