Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880809 | 1,4-disubstituted piperazines (or homopiperazines) as platelet-activating factor antagonists | Katsumi Itoh, Kohei Nishikawa | 1989-11-14 |
| 4871842 | Piperidine derivatives | Kohei Nishikawa, Katsumi Ito | 1989-10-03 |
| 4816466 | Piperidine derivatives | Kohei Nishikawa, Katsumi Ito | 1989-03-28 |