Patents by Inventor Graham Evans

Graham Evans 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).

  • Silver halide color photographic material containing yellow coupler
    Patent number: 4115121
    Abstract: Color photographic material is provided which contains at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## wherein G is the radical of a yellow coupler which is bonded to the heterocyclic ring by means of the active methylene group, Z is --CO-- or --SO.sub.2 --, M is hydrogen if Z is --CO--; or a substituent and R is hydrogen or a substituent.
    Type: Grant
    Filed: March 30, 1977
    Date of Patent: September 19, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Graham Evans, Mario Fryberg, Thomas Stauner, Paul Tschopp, David G. Leppard