Patents by Inventor Alexis Zinn-Warner

Alexis Zinn-Warner 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 materials with improved image tone
    Patent number: 5851751
    Abstract: A silver halide emulsion of average grain size 0.2 .mu.m or less comprising silver halide grains having a core and an outer shell, the core comprising at least 85 mol % of the total silver halide content of the grain and at least 50 mol % of the silver halide in the core being silver bromide, and the outer shell comprising silver halide of which greater than 50 mol % is silver chloride; the emulsion either containing no rhodium dopant, or containing rhodium dopant such that the concentration of said dopant is at least as great in the core as in the shell.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: December 22, 1998
    Assignee: Imation Corp.
    Inventors: Julian M. Wallis, Robert J. D. Nairne, Alexis Zinn-Warner