Patents by Inventor Joseph A. Sprung

Joseph A. Sprung 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).

  • Amphoteric maleic anhydride copolymers and photographic emulsions employing the same
    Patent number: 4033772
    Abstract: A photographic silver halide emulsion wherein the emulsion binder comprises the reaction product of 1) a reactant having an amino, mercapto or hydroxy functionality and a cationic active group with 2) a copolymer of maleic anhydride and an ethylenically unsaturated copolymerizable monomer.
    Type: Grant
    Filed: December 9, 1975
    Date of Patent: July 5, 1977
    Assignee: GAF Corporation
    Inventors: Joseph A. Sprung, Theodore Panasik, James J. Holmes