Patents by Inventor Rudolph Wanka

Rudolph 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).

  • White photographic paper support and method of producing same
    Patent number: 4396671
    Abstract: A photographic support material includes a base paper upon which a polyolefin coating is coated on at least one side. The coating includes titanium dioxide therein and at least one alkaline earth metal oxide in an amount of about 0.05-20% by weight of the coating, preferably calcium and/or magnesium oxide, and/or an alkaline earth metal carbonate in an amount of about 0.05-10% by weight of the coating, preferably calcium and/or magnesium carbonate.
    Type: Grant
    Filed: June 25, 1981
    Date of Patent: August 2, 1983
    Assignee: Felix Schoeller, Jr., GmbH & Co., K.G.
    Inventors: Rudolph Wanka, Heinz Wilke, Wolfram Wysk, Uwe Jensen