Patents by Inventor Edwin N. Oftedahl

Edwin N. Oftedahl 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).

  • Dry heat-activated bleaching of silver images
    Patent number: 4168170
    Abstract: A dry, activator sheet for a dry, thermal silver dye-bleach process, in the absence of a silver dye-bleach catalyst, comprises a support having thereon a nonvolatile, diffusible acid and a non-hydrolyzable polymeric vehicle having an effective pH up to 4.0 and a melting point lower than 200.degree. C. The activator sheet is useful to bleach a silver image containing a bleachable dye.
    Type: Grant
    Filed: February 17, 1978
    Date of Patent: September 18, 1979
    Assignee: Eastman Kodak Company
    Inventors: Rowland G. Mowrey, Edwin N. Oftedahl