Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6807018 | Objective lens for optical pick-up | Koichi Maruyama | 2004-10-19 |
| 6785215 | Astigmatic objective lens for optical head | Koichi Maruyama | 2004-08-31 |
| 6473387 | Optical disc apparatus | Koichi Maruyama | 2002-10-29 |