Patents by Inventor Ralf-Burckhard Dethlefs

Ralf-Burckhard Dethlefs 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).

  • Patent number: 4895757
    Abstract: A paper support material for photographic layers, as well as a process for the manufacture of such a support material, includes coating the paper on at least one side with a polyolefin layer containing a polyalkylene glycol, preferably a polyethylene glycol, a polypropylene glycol, or a copolymer of ethylene oxide and propylene oxide in a quantity between 40 ppm and 1% by weight, relative to the total quantity of the polyolefin. The molecular weight of the polyethylene glycol can be between 100 and 35,000, preferably 400 to 20,000, that of the polypropylene glycol can be between 400 and 10,000, preferably between 2,000 and 4,000, and that of the copolymers of ethylene oxide and propylene oxide can be between 200 and 20,000. In addition to the polyalkylene glycol, the polyolefin layer advantageously contains a fatty acid derivative from the group of soaps and fatty acid amides.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: January 23, 1990
    Assignee: Felix Schoeller, Jr. GmbH & Co. K.G.
    Inventors: Wolfram Wysk, Bernd Scholz, Ralf-Burckhard Dethlefs