Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882426 | Beads of cross-linked glucomannan and production thereof | — | 1989-11-21 |
| 4840975 | Spherical grains of polyamino acid and production method thereof | Chuichi Hirayama, Hirotaka Ihara | 1989-06-20 |