Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4657591 | Ink composition | Yasushi Okuda | 1987-04-14 |
| 4604139 | Dual color ink composition | Yukito Shoji | 1986-08-05 |
| 4545819 | Writing implement containing dual color ink composition | Yukito Shoji | 1985-10-08 |
| 4525215 | Ink composition | Mikihiko Nakanishi | 1985-06-25 |
| 4490177 | Dual color ink composition | Yukito Shoji | 1984-12-25 |
| 4256494 | Erasable ink composition for writing on an impervious surface | Masaji Yamamoto, Kimio Murakami | 1981-03-17 |