Issued Patents 1994
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5374668 | Casting epoxy resin, polythiol and releasing agent to form lens | Katsuyoshi Sasagawa, Masao Imai | 1994-12-20 |
| 5352758 | Mercapto compound, its preparation process, and sulfur-containing urethane resins and lenses using the same | Katsuyoshi Sasagawa, Seiichi Kobayashi | 1994-10-04 |
| 5306799 | High refractive index plastic lens and composition therefor | Seiichi Kobayashi, Katsuyoshi Sasagawa | 1994-04-26 |
| 5283312 | Mercapto compound, its preparation process, and sulfur-containing urethane resins and lenses using the same | Katsuyoshi Sasagawa, Seiichi Kobayashi | 1994-02-01 |