Patents by Inventor Emmett S. McCaskill

Emmett S. McCaskill 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).

  • Multicolor diffusion transfer photographic film elements
    Patent number: 5571656
    Abstract: There is described a multicolor diffusion transfer film unit having a plurality of different color image components, each of which includes a color-sensitive silver halide emulsion in association with a corresponding image dye-providing material and a first silver halide developer which takes part in photographic development to provide an imagewise pattern of diffusible image dye-forming material as a function of photoexposure. At least one of said color image components includes a second silver halide developer, or a precursor thereof, which is capable of developing silver halide indiscriminately and which is made available after photographic development in the color image component in which it is located is substantially completed.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: November 5, 1996
    Assignee: Polroid Corporation
    Inventors: Edward D. Kingsley, Emmett S. McCaskill, Avinash C. Mehta, Kenneth C. Waterman
  • Silver halide emulsions spectrally sensitized to infrared radiation with novel cyanine dyes
    Patent number: 5254455
    Abstract: This invention relates to photographic silver halide emulsions spectrally sensitized to infrared radiation above 800 nm and to a class of pentamethine cyanine dyes of 5-fluorobenzothiazole derivatives useful as the infrared sensitizing dyes.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: October 19, 1993
    Assignee: Polaroid Corporation
    Inventors: Zbigniew J. Hinz, Emmett S. McCaskill
  • Benzotriazine compounds
    Patent number: 4497950
    Abstract: This application relates to the use of certain dihydro-benzotriazine compounds as photographic silver halide developing agents and to photographic processes, products and compositions which utilize the same. The compounds are effective developers in acid environment as well as in basic environment. Also described are novel dihydro-benzotriazine compounds.
    Type: Grant
    Filed: September 28, 1983
    Date of Patent: February 5, 1985
    Assignee: Polaroid Corporation
    Inventor: Emmett S. McCaskill
  • Novel benzotriazine developers and photographic product and method
    Patent number: 4420551
    Abstract: This application relates to the use of certain dihydro-benzotriazine compounds as photographic silver halide developing agents and to photographic processes, products and compositions which utilize the same. The compounds are effective developers in acid environment as well as in basic environment. Also described are novel dihydro-benzotriazine compounds.
    Type: Grant
    Filed: January 31, 1983
    Date of Patent: December 13, 1983
    Assignee: Polaroid Corporation
    Inventor: Emmett S. McCaskill