Patents by Inventor Paul W. Twombly

Paul W. Twombly 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).

  • Film for duplicating silver images in radiographic films
    Patent number: 5491058
    Abstract: A film is disclosed for duplicating a silver image in a radiographic film. A single monodispersed fogged direct-positive emulsion layer is employed. To extend exposure latitude the emulsion layer contains micro-crystalline particles of a dye that competes with the fogged direct positive grains of the emulsion layer for absorption of exposing radiation and can be decolorized during photographic processing.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: February 13, 1996
    Assignee: Eastman Kodak Company
    Inventors: Ralph W. Jones, Catherine C. Wideman, Paul W. Twombly
  • Asymmetrical radiographic elements, assemblies and packages
    Patent number: H1105
    Abstract: An asymmetric radiographic element is disclosed comprised of a transparent film support, silver halide emulsion layer units of differing sensitometric characteristics coated on opposite sides of the film support, and a processing solution decolorizable means for reducing crossover to less than 10 percent. The radiographic element is positioned between intensifying screens and mounted in a cassette for exposure to X-radiation. A feature is included for ascertaining which of the emulsion layer units is positioned nearest a source of X-radiation during exposure.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: September 1, 1992
    Assignee: Eastman Kodak Company
    Inventors: Richard J. Jebo, Paul W. Twombly, Robert E. Dickerson, Phillip C. Bunch