Patents by Inventor Ralph B. Neilsen

Ralph B. Neilsen 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).

  • Polymeric scavengers for oxidized developing agents and photographic elements containing the same
    Patent number: 5198517
    Abstract: Reducing agents for oxidized developing agents and light sensitive elements containing the reducing agents wherein the reducing agents comprise a polymer having gallic acid or gallic acid derivative moieties.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: March 30, 1993
    Assignee: Eastman Kodak Company
    Inventors: Ralph B. Neilsen, Lan B. Thai, Hwei-ling Yau