Patents Represented by Attorney J. T. Lewis
  • Patent number: 3933501
    Abstract: Color photographic elements containing silver halide and incorporated color-forming materials are described. These elements contain at least two differentially light-sensitive emulsion layers, the overlying layer being sensitive to the relatively shorter wavelengths and containing at least one yellow dye-forming color coupler which has the unusual ability to inhibit the reaction of competing couplers (such as citrazinic acid, for example) when competing couplers are used in color developing solutions in the conventional manner. Use of these couplers in the overlying (color) layer of multi-layer color photographic elements makes it possible to produce colored images having improved graininess.Couplers having this unusual capability are selected from those having the structures: ##SPC1##Wherein R.sub.1, R.sub.2 and R.sub.3 are as defined herein.
    Type: Grant
    Filed: June 10, 1974
    Date of Patent: January 20, 1976
    Assignee: Eastman Kodak Company
    Inventors: Robert G. Cameron, Dan Neuberger
  • Patent number: RE28760
    Abstract: Photographic elements are provided which feature a support having coated thereon a first photographic silver halide emulsion layer containing image-forming coupler and development inhibitor-releasing coupler; and, a second silver halide emulsion layer containing photographic image-forming coupler, the second layer having a faster effective speed sensitivity than the first layer. Such elements have high contrast for faint images and an extended latitude of low contrast for bright images.
    Type: Grant
    Filed: August 20, 1975
    Date of Patent: April 6, 1976
    Assignee: Eastman Kodak Company
    Inventors: John C. Marchant, Robert F. Motter