Patents by Inventor August Knapp

August Knapp 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).

  • Process for preparing rutile-coated mica pigments
    Patent number: 4867794
    Abstract: In mica/titanium dioxide pigments reliable rutilization is obtained with small amounts of tin by precipitating tin dioxide directly on the mica and completing this precipitation before the precipitation of titanium dioxide is started.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: September 19, 1989
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Klaus Ambrosius, August Knapp, Helmut Plamper, Reiner Esselborn