Issued Patents 1989
Showing 1–1 of 1 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 | Takaharu Itagaki, Hiroshi Kusano, Eiji Miyata | 1989-09-05 |