Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7801014 | Manufacturing method of optical disc and optical disc | Yoshihiro Sugiura | 2010-09-21 |
| 4819778 | Engagement device for an electromagnetic spring-wound clutch | Isamu Shirai, Susumu Ujiie | 1989-04-11 |