Patents by Inventor Yonosuke Tsuka

Yonosuke Tsuka 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).

  • Silver halide photographic lith material
    Patent number: 4724196
    Abstract: A lith-type silver halide photographic material comprising a tetrahydro-1,3,5-triazine-2-thione derivative and a polyalkylene oxide derivative.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: February 9, 1988
    Inventors: Tadao Shoji, Yonosuke Tsuka, Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu