Patents by Inventor Carol J. MacDonald

Carol J. MacDonald 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 bleaching and bleach-fixing solutions
    Patent number: 4933266
    Abstract: Bleaching and bleach-fixing solutions, especially useful in the processing of a photographic color material, contain a bleaching agent comprising a ferric complex of propylenediaminetetraacetic acid and a hydroxy-substituted chelating agent present in an amount sufficient to reduce the formation of ferric propylenediaminetetraacetic acid precipitates. The solutions do not generate unacceptable stain or adversely affect leuco cyan dye recovery or process cleanliness.
    Type: Grant
    Filed: March 1, 1988
    Date of Patent: June 12, 1990
    Assignee: Eastman Kodak Company
    Inventors: Keith H. Stephen, Carol J. MacDonald