Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4412045 | Color developer for pressure-sensitive copying paper | Koji Hirai | 1983-10-25 |
| 4409374 | Color developer for pressure-sensitive copying paper | Koji Hirai | 1983-10-11 |
| 4216299 | Color developer for pressure-sensitive copying paper | Koji Hirai | 1980-08-05 |
| 4216300 | Color developer for pressure-sensitive copying paper | Koji Hirai | 1980-08-05 |