Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863972 | Porous cross-linked polyvinyl alcohol particles, process for producing the same, and separating agent composed of the same | Hiroshi Kusano, Eiji Miyata, Takayuki Tashiro | 1989-09-05 |
| 4857576 | Method for rendering a flammable polymer material flame-resistant | Hiromi Kochi, Kenji Fukunaga, Tsuyoshi Ito | 1989-08-15 |
| 4808683 | Vinylamine copolymer, flocculating agent using the same, and process for preparing the same | Mitsuaki Shiraga, Shigeru Sawayama, Kohichi Satoh | 1989-02-28 |