Patents by Inventor Homer G. Duda

Homer G. Duda 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).

  • Non-aqueous silver halide diffusion imaging system
    Patent number: 4507381
    Abstract: A self-contained silver halide diffusion transfer imaging sheet is provided which contains three layers on a substrate. The first layer is a silver halide emulsion formed in a non-ionic material. The intermediate layer is a water barrier. The third layer is a nucleating region which contains collodial silver. A developer, base and silver transport agent can also be located in these layers. For example, the base and silver transport agent can be located in the nucleating layer, with the developer located in the emulsion layer. After the emulsion is exposed to actinic radiation, a non-aqueous activating medium is supplied which initiates the development and diffusion transfer processes. The final result is a positive image in the nucleating layer.
    Type: Grant
    Filed: April 10, 1984
    Date of Patent: March 26, 1985
    Assignee: The Mead Corporation
    Inventors: Paul C. Adair, Homer G. Duda, Amy L. Burkholder, Richard F. Wright, Mary M. Stanley
  • Non-aqueous silver halide diffusion imaging system
    Patent number: 4476213
    Abstract: A self-contained silver halide diffusion transfer imaging sheet is provided which contains three layers on a substrate. The first layer is a silver halide emulsion formed in a non-ionic material. The intermediate layer is a water barrier. The third layer is a nucleating region which contains colloidal silver. A developer, base and silver transport agent can also be located in these layers. For example, the base and silver transport agent can be located in the nucleating layer, with the developer located in the emulsion layer. After the emulsion is exposed to actinic radiation, a non-aqueous activating medium is supplied which initiates the development and diffusion transfer processes. The final result is a positive image in the nucleating layer.
    Type: Grant
    Filed: December 10, 1982
    Date of Patent: October 9, 1984
    Assignee: The Mead Corporation
    Inventors: Paul C. Adair, Amy L. Burkholder, Homer G. Duda, Richard F. Wright, Mary M. Stanley