Patents by Inventor Herbert Gropp

Herbert Gropp 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).

  • Built-up camshaft
    Publication number: 20020157500
    Abstract: A pipe or a solid rod (1) is coated on the outer surface, or cams (3) and/or other parts are coated on their inner surface with a suitable coating (2), for example a joint-stable conversion coating, in order to produce a cost-advantageous mass product with commercially available materials and semifinished materials by a longitudinal pressing on of cams and other parts onto the pipe or solid rod.
    Type: Application
    Filed: January 3, 2000
    Publication date: October 31, 2002
    Inventors: Herbert Gropp, Dietmar Klose, Claus-Peter Durlich, Manfred Janssen
  • Process for the preparation of 3,7-dialkylxanthines
    Patent number: 5210192
    Abstract: The invention is directed to a process for preparing 3,7-dialkylxanthines of the formula I ##STR1## (R.sup.1 and R.sup.2 denote C.sub.1 -C.sub.4 -alkyl) by the reaction of 4-amino-imidazolecarboxamide-(5) of the formula II ##STR2## with an alkali cyanate in aqueous solution at a pH of from 3 to 5 followed by cyclization of the resulting urea derivative at a pH of from 8 to 14.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: May 11, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Marius Bugglin, Herbert Gropp, Lothar Janitschke, Ulrich Karl, Hans-Heinrich Lenz