Patents by Inventor Bernard D. Stich

Bernard D. Stich 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).

  • Core/shell silver donors for photothermographic systems comprising an oxidatively more reactive shell
    Patent number: 6576414
    Abstract: The present invention is directed to a photothermographic element comprising silver halide, a blocked developer, a coupler, and core/shell particles, each such particle comprising a mixture of at least two non-photosensitive organic silver salts, which particle comprises a center portion comprising a non-photosensitive first organic silver salt and at least one shell portion covering the center portion, the shell comprising a non-photosensitive second organic silver salt. The organic silver salt in the shell has a lower pKsp relative to the organic silver salt in the core. This invention also provides a composition comprising the core/shell non-photosensitive organic silver salt particles, and a method of making the particles.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: June 10, 2003
    Assignee: Eastman Kodak Company
    Inventors: Mark E. Irving, David H. Levy, Bernard D. Stich, Mark R. Mis, Stephen Swingley, Donald L. Black
  • High bromide tabular grain emulsions with edge placement of epitaxy
    Patent number: 6114105
    Abstract: A high bromide {111} tabular grain emulsion is disclosed in which most of the tabular grains exhibit silver salt epitaxy at a single site. Most of the silver halide epitaxy sites contact an edge region of the tabular grains. These emulsions exhibit chemical sensitization by the epitaxy and surprising lower levels of desensitization by spectral sensitizing dyes.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: September 5, 2000
    Assignee: Eastman Kodak Company
    Inventors: Thomas B. Brust, Bernard D. Stich