Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6736506 | Eyeglasses made-to-order system | Yukihiro Izumitani, Isao Iizuka, Yasushi Sakai, Shigeru Watanabe | 2004-05-18 |
| 6638573 | Spectacles frame surface treatment method | Masami Nakamoto | 2003-10-28 |
| 6533418 | System for making spectacles to order | Yukihiro Izumitani, Isao Iizuka, Yasushi Sakai, Shigeru Watanabe | 2003-03-18 |
| 6340226 | Spectacles accommodating interchangeable/replaceable lens | Kazumichi Kurihara, Yasushi Sakai, Hakaru Fujita, Youichi Ishiguro, Isao Iizuka +1 more | 2002-01-22 |