Patents by Inventor Takuzo Ishida

Takuzo Ishida 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 stabilizers for syringaldazine leuco dyes
    Patent number: 4587211
    Abstract: Certain effective leuco dyes for silver halide/silver salt/reducing agent photothermographic color imaging materials tend to bleach in the final image. The presently disclosed system of a syringaldazine and a stabilizing binder resin is more stable.
    Type: Grant
    Filed: February 1, 1985
    Date of Patent: May 6, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Takuzo Ishida, David C. Weigel