Patents by Inventor James R. Kulp

James R. Kulp 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).

  • Process for recovery of silver from hardening photoprocessing solutions
    Patent number: 5961939
    Abstract: There is provided a method for removing silver from photoprocessing solutions containing hardening agents which comprises:a) adding a chelating agent to the photoprocessing solution in an amount sufficient to inhibit the precipitation of the high valent cations of the hardening agents;b) adding a base to adjust the pH of the photoprocessing solution to a value above 5.5; andc) adding a chemical precipitant for the silver contained in the photoprocessing solution;and optionally adding as a final component a flocculating agent which causes the precipitate to grow in size.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: October 5, 1999
    Assignee: Eastman Kodak Company
    Inventors: James R. Kulp, Charles S. Christ, Jr., Jay E. Mathewson