Patents by Inventor Eleanor Chaffee

Eleanor Chaffee 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).

  • Tabular grain silver iodobromide emulsion of improved sensitivity and process for its preparation
    Patent number: 5358840
    Abstract: Silver iodobromide tabular grain emulsions of enhanced photographic sensitivity are disclosed. The silver iodobromide grains contain from 2 to less than 10 mole percent iodide, exhibit a coefficient of variation of less than 20 percent, and consisting essentially of tabular grains having opposed parallel major faces. Each of the tabular silver bromoiodide grains exhibit an iodide concentration in excess of 6 mole percent within a surface region extending to a depth of less than 0.02 .mu.m and exhibit a central iodide concentration of less than 2 mole percent.
    Type: Grant
    Filed: July 22, 1993
    Date of Patent: October 25, 1994
    Assignee: Eastman Kodak Company
    Inventors: Eleanor Chaffee, Mamie Kam-Ng, Allen K. Tsaur, David E. Fenton, Donald L. Black
  • Image-transfer reversal emulsions and elements with incorporated quinones
    Patent number: 4341858
    Abstract: Direct-positive photographic emulsions and elements which include internal-image silver halide grains, a nucleating amount of a hydrazine compound and a redox dye releaser are improved by the incorporation of a nucleation-promoting amount of a quinone oxidizing agent. Diffusion transfer images made from elements using these emulsions exhibit improved image discrimination and improved maximum density.
    Type: Grant
    Filed: May 1, 1981
    Date of Patent: July 27, 1982
    Assignee: Eastman Kodak Company
    Inventors: Eleanor Chaffee, Richard C. Tuites