Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837337 | Process for producing pyrrolidone derivative | Masao Miyake | 1989-06-06 |
| 4824913 | Process for preparing water-soluble polymer | Shigeru Sawayama, Kohichi Satoh | 1989-04-25 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837337 | Process for producing pyrrolidone derivative | Masao Miyake | 1989-06-06 |
| 4824913 | Process for preparing water-soluble polymer | Shigeru Sawayama, Kohichi Satoh | 1989-04-25 |