Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885284 | Dihydropyridine-5-phosphonic acid cyclic propylene ester | Sakuya Tanaka, Ryozo Sakoda | 1989-12-05 |
| 4879400 | Process for producing alpha-(benzylidene)acetonylphosphonates | Hiroo Matsumoto, Ryozo Sakoda | 1989-11-07 |
| 4843076 | Dihydropyridine-5-phosphonic acid cyclic ester | Ryozo Sakoda, Hiroo Matsumoto, Yoshimasa Kamikawaji, Sakuya Tanaka | 1989-06-27 |
| 4839361 | Dihydropyridine-5-phosphonic acid cyclic propylene ester | Sakuya Tanaka, Ryozo Sakoda | 1989-06-13 |