Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5693738 | Composition for urethane-base plastic lens, urethane-base plastic lens obtained from the composition, and process for the production of the plastic lens | Koju Okazaki, Chitoshi Shimakawa, Mamoru Tanaka, Teruyuki Nagata, Seiichi Kobayashi +3 more | 1997-12-02 |
| 5608115 | Polythiol useful for preparing sulfur-containing urethane-based resin and process for producing the same | Koju Okazaki, Teruyuki Nagata | 1997-03-04 |
| 5594088 | Plastic lenses having a high-refractive index, process for the preparation thereof and casting polymerization process for preparing sulfur containing urethane resin lens and lens prepared thereby | Teruyuki Nagata, Koju Okazaki, Tohru Miura, Nobuyuki Kajimoto, Katsuyoshi Sasagawa +1 more | 1997-01-14 |