Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5401549 | Optical information recording medium | — | 1995-03-28 |
| 4389972 | Toner concentration control apparatus | Koji Hirakura, Yasuo Sawada, Takeshi Iijima | 1983-06-28 |
| 4369733 | Toner concentration control apparatus | Koji Hirakura, Yasuo Sawada, Takahiko Kitamura | 1983-01-25 |
| 4266141 | Toner developing ability measuring system for electrostatography | Koji Hirakura, Yasuo Sawada | 1981-05-05 |