Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845210 | Azetidinone derivatives and processes for production thereof | Takeshi Nakai | 1989-07-04 |
| 4841062 | New cephem and cepham compounds and processes for preparation thereof | Takao Takaya, Hisashi Takasugi, Kiyoshi Tsuji | 1989-06-20 |
| 4822888 | New cepham compounds and processes for the production thereof | Takao Takaya, Hisashi Takasugi, Kiyosha Tsuji | 1989-04-18 |