Patents by Inventor Jean-Francois Diaz

Jean-Francois Diaz 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 regenerating seasoned aqueous fixing or bleach/fixing solutions
    Patent number: 5958245
    Abstract: The invention concerns a method and a device for the selective extraction of the halide ions from photographic baths. According to the invention, the solutions to be treated are subjected to a first nanofiltration step 2 in diafiltration mode, then to a second nanofiltration step 3 in concentration mode. The method makes it possible to prolong the activity of the fixing or bleaching/fixing baths during the processing of photographic products.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: September 28, 1999
    Assignee: Eastman Kodak Company
    Inventors: Didier J. Martin, Christian G. Guizard, Jean-Francois Diaz
  • 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