Patents by Inventor Werner Duismann

Werner Duismann 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).

  • Identification of absorbent material with a thermostable colorant and process
    Patent number: 5032452
    Abstract: A process is provided for applying a thermostable identification mark to an absorbent material such as piece goods or ceramics. A cobalt salt solution containing hydrogen peroxide is applied in the form of a mark to the surface of an absorbent material, followed by a thermal aftertreatment above 400.degree. C. for stabilization of the identifying mark.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: July 16, 1991
    Assignee: Huels Aktiengesellschaft
    Inventors: Bernd Nowitzki, Annette Sandkuhler, Werner Duismann, Karin Muller, Peter Rennwanz