Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5698682 | Azo compounds and polarizing films using the compounds | Ryu Oi, Rihoko Imai, Keisuke Takuma, Hisato Itoh | 1997-12-16 |
| 5659039 | Quinophthalone compounds | Akira Ogiso, Rihoko Imai, Tsutami Misawa, Ryu Oi, Hisato Itoh | 1997-08-19 |
| 5639809 | Azo compounds and polarizing films using the compounds | Ryu Oi, Rihoko Imai, Keisuke Takuma, Hisato Itoh | 1997-06-17 |