Patents by Inventor John K. C. Kempster

John K. C. Kempster 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: 5380632
    Abstract: A photosensitive photographic silver halide colour material comprising at least two dye image-forming units each separated from its neighbouring units by a layer containing a scavenger for oxidised developing agent, each unit comprising at least one silver halide emulsion layer and at least one dye image-forming colour coupler, the material comprising a total silver halide coating weight of less than 300 mg/m.sup.2 (as silver) characterised in that at least one image-forming unit contains extra gelatin either in a layer adjacent to the coupler-containing layer or in the coupler-containing layer itself such that the gelatin content of the unit is more than 800 mg/m.sup.2, in order to decrease the band width of the dye formed from said coupler.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: January 10, 1995
    Assignee: Eastman Kodak Company
    Inventors: Peter D. Marsden, John K. C. Kempster, John A. Bee