Patents by Inventor Norman C. Haylett

Norman C. Haylett 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).

  • Patent number: 4306015
    Abstract: A process for the production of an improved photographic image is provided which comprises imagewise exposing photographic material which comprises on a support base at least one light-sensitive negative-working silver halide emulsion layer containing a color coupler (receptor layer) and in which after color processing a negative dye image only is formed, there being associated therewith at least one light-sensitive negative-working silver halide emulsion layer containing at least one DIR compound (development inhibitor releasing compound) and in which after processing no photographic image is present (donor layer), developing the photographic material in a color photographic developing solution to form a negative silver image in the layer which comprises the DIR compound and a coupled compound with the DIR compound in the areas in which the silver has been developed, so releasing the DI compound imagewise from the DIR compound and allowing the DI compound to diffuse imagewise into the layer containing the co
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: December 15, 1981
    Assignee: Ciba-Geigy AG
    Inventor: Norman C. Haylett