Patents by Inventor Oanh Van Pham

Oanh Van Pham 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).

  • Photothermographic elements
    Patent number: 4784939
    Abstract: Radiation sensitive thermally developable imaging elements comprise:(a) photosensitive silver halide,(b) light insensitive silver salt oxidizing agent,(c) reducing agent for silver ions, and(d) a benzoyl acid class of antifoggant.The antifoggants are effective in both reducing spurious background image densities and in stabilizing the film against sensitometric changes during storage.
    Type: Grant
    Filed: September 2, 1987
    Date of Patent: November 15, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Oanh Van Pham