Patents by Inventor Stephen Joseph Waffle

Stephen Joseph Waffle 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).

  • Method for preparing a ready-to-use photographic bleaching solution
    Patent number: 5753423
    Abstract: A ready-to-use bleaching or bleach-fixing solution can be prepared by mixing an aqueous solution of succinic acid, maleic acid or malic acid, and an aminopolycarboxylic acid ligand, adding a ferric salt to form a ferric ligand chelate, and adding a chemical base, such as ammonia, to provide a final pH of from 2.5 to 5.5. optionally, a portion of the chemical base can be added before the addition of the ferric salt.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: May 19, 1998
    Assignee: Eastman Kodak Company
    Inventors: Jean Marie Buongiorne, Stephen Joseph Waffle, Richard Thomas Clark