Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6589983 | Benzopyran derivative | Keizo Tanikawa, Kazuhiko Ohrai, Yukihiro Shigeta, Toru Tsukagoshi, Toru Yamashita | 2003-07-08 |
| 6555574 | 4-oxybenzopyran derivative | Keizo Tanikawa, Kazuhiko Ohrai, Yukihiro Shigeta, Toru Tsukagoshi, Toru Yamashita | 2003-04-29 |