Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7527376 | Method for designing spectacle lens, spectacle lens, and spectacles | Ayumu Ito, Tadashi Kaga | 2009-05-05 |
| 7070274 | Spectacle lens | Kazutoshi Kato, Tadashi Kaga | 2006-07-04 |