Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5516467 | Process for producing a tinted contact lens | Kazuharu Niwa, Noriko Iwata, Yasuhiro Yokoyama | 1996-05-14 |
| 5118537 | Method for treating the surface of an oxygen permeable hard contact lens | Akihisa Sugiyama, Tatsutoshi Nakajima | 1992-06-02 |
| 4980208 | Method for treating the surface of an oxygen permeable hard contact lens | Akihisa Sugiyama, Tatsutoshi Nakajima | 1990-12-25 |
| 4814402 | Contact lens material | Tatsutoshi Nakashima, Akihisa Sugiyama | 1989-03-21 |
| 4529747 | Soft contact lenses | Yasuyuki Kato, Kentaro Kasuga, Masuji Ichihara, Tamio Suzuki | 1985-07-16 |