Patents by Inventor Gudrun Wittmann

Gudrun Wittmann 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).

  • Shell catalyst for producing acetic acid by gas phase oxidation of unsaturated C4 -hydrocarbons
    Patent number: 6274763
    Abstract: The invention relates to a shell catalyst for producing acetic acid by gas-phase oxidation of unsaturated C4-hydrocarbons, comprising an inert non-porous carrier and a catalytically active mixed oxide material applied on the outer surface of the carrier, wherein said material contains (a) one or several oxides from the group titanium dioxide, zircon dioxide, stannic dioxide, aluminum oxide, and b) 0.1 to 1.5 wt. % vanadium pentoxide in relation to the weight of the constituent (a) and per m2/g of the specific surface of the constituent (a).
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: August 14, 2001
    Assignee: Consortium für elektrochemische Industrie GmbH
    Inventors: Christoph Ruedinger, Hans-Juergen Eberle, Norbert Zeitler, Max Wollin, Gudrun Wittmann