Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4904708 | Method of manufacturing soft contact lens material | Isao Kaetsu, Minoru Kumakura, Hidenari Suyama, Hideo Kouyama | 1990-02-27 |
| 4839109 | Process for producing a contact lens | Isao Kaetsu, Minoru Kumakura, Hidenari Suyama, Hideo Koyama | 1989-06-13 |