Patents by Inventor Jurgen Donch

Jurgen Donch 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: 4851189
    Abstract: Method of manufacturing cams for camsshafts by powder metallurgy, wherein the formed cams have constant properties over the volume thereof and are well polishable, includes molding into a cam blank a powder mixture made up of iron powder alloyed with carbide-forming elements of the fifth and sixth secondary groups of the periodic table, and graphite powder in a quantity necessary for carbide formation; sintering the blank at a temperature of at most 50 K above a solidus temperature of the blank; and compacting the blank by hot-isostatic compression at a temperature below the solidus temperature to at least 99% of a theoretical density.
    Type: Grant
    Filed: August 17, 1988
    Date of Patent: July 25, 1989
    Assignee: Ringsdorff-Werke GmbH
    Inventors: Jurgen Donch, Bernhard Schelb, Wolfgang Zimmermann