Patents by Inventor Yasuko Yokoyama

Yasuko Yokoyama 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).

  • Photosensitive relief printing plate and photosensitive intaglio printing plate
    Patent number: 5698373
    Abstract: The present invention relates to a photosensitive relief or intaglio printing plate comprising a base and a photocurable photosensitive layer formed on the base, the photocurable photosensitive layer containing a dye precursor which forms a dye upon irradiation of actinic light. A relief (convex) pattern or a concave pattern can be recognized by coloring, thereby facilitating the printing plate inspecting work. The developing solution used is not colored or contaminated.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: December 16, 1997
    Assignee: Toray Industries, Incorporated
    Inventors: Junichi Fujikawa, Takao Kinashi, Shigetora Kashio, Yasuko Yokoyama