Patents by Inventor Warren William Evans

Warren William 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 films with controlled gradient balance
    Patent number: 3992210
    Abstract: Films in which the various color gradients are particularly balanced in relationship to each other are prepared from sensitized emulsions prepared separately and then either coated as separate layers or mixed just prior to coating. These films are particularly useful as color separation negatives where machine processing is used and where identical processing conditions for each color record are desirable.
    Type: Grant
    Filed: June 5, 1973
    Date of Patent: November 16, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Warren William Evans