Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6288998 | Optical disk and manufacturing method of original optical disk | — | 2001-09-11 |
| 6026072 | Optical disk and method of manufacturing the same | Toshiyuki Nakano, Masaaki Matsumaru | 2000-02-15 |
| 5959962 | Optical disk having a format condition information drive | Masaaki Matsumaru | 1999-09-28 |
| 5809003 | Optical disk and optical information reproducing apparatus | Toshiyuki Nakano, Masaaki Matsumaru, Yasuo Motegi | 1998-09-15 |
| 5057685 | Optical rotation detector including a disk having slits with concave and convex parts and method of manufacturing | Ryoichi Kurosawa | 1991-10-15 |