Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4824913 | Process for preparing water-soluble polymer | Yoshikazu Murao, Shigeru Sawayama | 1989-04-25 |
| 4808683 | Vinylamine copolymer, flocculating agent using the same, and process for preparing the same | Takaharu Itagaki, Mitsuaki Shiraga, Shigeru Sawayama | 1989-02-28 |