Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5120359 | Erasable ink compositions | Shingo Uzukawa | 1992-06-09 |
| 4604139 | Dual color ink composition | Keiko Shioi | 1986-08-05 |
| 4545819 | Writing implement containing dual color ink composition | Keiko Shioi | 1985-10-08 |
| 4490177 | Dual color ink composition | Keiko Shioi | 1984-12-25 |
| 4460727 | Water base pigment ink composition for writing | — | 1984-07-17 |