Patents by Inventor Stephan Weigel

Stephan Weigel 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).

  • Spark plug electrode including a profiled noble-metal part
    Patent number: 6630771
    Abstract: A spark plug electrode having a welded-on noble-metal part for a longer service life of the spark plug. Prior to the welding process, the noble-metal part is provided with a profiling on the side facing the spark plug electrode.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: October 7, 2003
    Assignee: Robert Bosch GmbH
    Inventors: Heinz Ulm, Rainer Kocik, Stephan Weigel, Jochen Fischer, Peter Metzler, Detlef Hartmann
  • Extrusion molded electrode formed as compound body and a method of producing the same
    Patent number: 5551902
    Abstract: A compound electrode, in particular an electrode for a spark plug, has a core composed of a first electrically conductive material, and a casing deformed to surround the core and composed of a second electrically conductive material. The casing is formed in a single extrusion molding step that also shapes the core and simultaneously forms the cross-sectional profile of the electrode.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: September 3, 1996
    Assignee: Robert Bosch GmbH
    Inventors: Hans Hubert, Werner Langer, Walter Wuest, Stephan Weigel