Patents by Inventor Didier Jean Martin

Didier Jean Martin 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 and device for the selective extraction of halide ions from photographic baths
    Patent number: 5679503
    Abstract: The invention concerns a method and a device for extracting the halide ions from fixing or bleaching/fixing photographic solutions containing mainly thiosulfate as the fixing agent, bringing the solutions into contact with a nanofiltration module including at least two membranes of different types.The method enables the activity of the fixing or bleaching/fixing baths to be extended during the processing of photographic products.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: October 21, 1997
    Assignee: Eastman Kodak Company
    Inventors: Didier Jean Martin, Christian Gilbert Guizard, Jean-Francois Diaz