Patents by Inventor Donald Singleton

Donald Singleton 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).

  • Photographic material and process comprising a pyrazolotriazole moiety
    Patent number: 5306607
    Abstract: A photographic element is disclosed comprising a support bearing at least one photographic silver halide emulsion layer and at least one photographic coupler comprising a pyrazolotriazole moiety (PT), the coupler having the formula ##STR1## wherein PT is a pyrazolotriazole moiety.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: April 26, 1994
    Assignee: Eastman Kodak Company
    Inventors: William J. Begley, Teh-hsuan Chen, Frank D. Coms, Donald Singleton