Patents by Inventor Yushi Miyashita

Yushi Miyashita 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).

  • Ink and eraser of the ink
    Patent number: 4557618
    Abstract: Colored ink comprising a developer having a phenolic hydroxyl group, an electron-donating colorless dye which develops a color by the action of the developer, and a solvent which does not inhibit a color developing reaction. Handwriting written in this colored ink can be erased by using an eraser comprising a desensitizing compound which makes the colored electron-donating dye colorless.
    Type: Grant
    Filed: December 22, 1982
    Date of Patent: December 10, 1985
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Masahiro Iwata, Yushi Miyashita, Yuichi Taka