Patents by Inventor Rudolf Wanka

Rudolf Wanka 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).

  • Waterproof photographic paper support
    Patent number: 4808267
    Abstract: A waterproof photographic paper support, which is coated with a polyolefin resin, is provided. The paper itself is formed from a particular paper pulp composition which contains fatty acids and/or fatty acid salts and an aluminum salt, as well as, if necessary, alkylketenedimer. Such paper pulp concentration contains, furthermore, anionic and cationic polyacrylamides in the ratio of 40:60 to 60:40, as well as an epoxidized fatty acid amide. The acrylic acid content of the anionic polyacrylamide amounts to between about 5% and 20%.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: February 28, 1989
    Assignee: Felix Schoeller, Jr. GmbH & Co. KG
    Inventors: Alois-Bernhard Kerkhoff, Rudolf Wanka, Wolfgang Storbeck