Patents by Inventor Richard T. Crowell

Richard T. Crowell 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).

  • Image anchorage in photographic films
    Patent number: 4076531
    Abstract: The anchorage of silver images to their supports, especially in wash-off films developed by tanning developing agents, is improved by incorporating cyclohexylamine or a derivative thereof in the silver halide emulsion layer, in a layer coated between the emulsion and the support, in an overcoat, or in the processing bath.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: February 28, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard T. Crowell