Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4436390 | Ophthalmic instrument having a cross cylinder lens | — | 1984-03-13 |
| 4299455 | Vision testing instrument | Yoshinori Oana, Yasuo Kato, Taketoshi Ishihara | 1981-11-10 |
| 4192582 | Ophthalmometer | Yoshikazu Konishi, Taketoshi Ishihara | 1980-03-11 |