Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6572451 | Spectacle lens machining method and apparatus | Isao Iizuka, Yasushi Sakai | 2003-06-03 |
| 6561738 | Spectacles lens boring jig positioning device | Yukihiro Izumitani | 2003-05-13 |
| 6540350 | Lens holding mechanism for spectacles | — | 2003-04-01 |
| 6340226 | Spectacles accommodating interchangeable/replaceable lens | Toshihisa Akaba, Kazumichi Kurihara, Yasushi Sakai, Youichi Ishiguro, Isao Iizuka +1 more | 2002-01-22 |