Patents by Inventor Sinichi Akasaka

Sinichi Akasaka 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).

  • Color ink sheet for thermal transfer
    Patent number: 4812439
    Abstract: When the reflection density of the colorants of an ink layer is 1.3 after transfer onto a recording paper, a reflectance of yellow colorant lies in between two diagrams (D.sub.1, D.sub.2) shown in FIG. 1, a reflectance of magenta colorant lies in between two diagrams (D.sub.3, D.sub.4) shown in FIG. 2, and a reflectance of cyan colorant lies in between two diagrams (D.sub.5, D.sub.6) shown in FIG. 3. A color ink sheet realizes an excellent hue, a high luminance factor and high chroma. A wide color specification range and clear image having a high color reproducibility is obtained.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: March 14, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Shuichi Ohara, Sinichi Akasaka, Hiroyuki Oka, Shintaroo Hattori