Patents by Inventor John C. Marchant

John C. Marchant 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).

  • Photographic element including superimposed silver halide layers of different speeds
    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