Patents by Inventor Axel Rau

Axel Rau 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).

  • Pearl luster pigments stable to glaze and enamel
    Patent number: 5022923
    Abstract: Pearl luster pigments based on mica flakes coated with metal oxides are provided with a top coating of tin dioxide and/or cerium dioxide to improve their stability in glazes and enamels.
    Type: Grant
    Filed: October 8, 1986
    Date of Patent: June 11, 1991
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Axel Rau, Klaus Ambrosius, Klaus D. Franz
  • Dispersible Berlin blue pigment
    Patent number: 4545821
    Abstract: A dispersible Berlin blue pigment comprises Berlin blue deposited on to mica platelets. The pigment is additionally coated with a first coat of basic aluminum sulfate and a second coat of a mixture of a metal hydroxide with a polysiloxane or a fatty acid.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: October 8, 1985
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Axel Rau, Klaus-Dieter Franz