Patents by Inventor Hao J. Chang

Hao J. Chang 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).

  • Water reservoir layers in bleach-fix sheets
    Patent number: 4480025
    Abstract: A bleach-fix sheet for use in color photographic processes comprises a support having thereon a bleach-fix layer and a water reservoir layer comprising a water-supplying polymer. In a preferred embodiment, the bleach-fix sheet is useful to bleach and fix a retained image in a color image diffusion transfer process.
    Type: Grant
    Filed: January 13, 1983
    Date of Patent: October 30, 1984
    Assignee: Eastman Kodak Company
    Inventors: Hao J. Chang, Gerhard Popp, Patrick H. Saturno