Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4449713 | Aqueously-swelling water stopper and a process of stopping water thereby | Hideo Tanaka | 1984-05-22 |
| 4443019 | Aqueously-swelling water stopper and a process of stopping water thereby | Hideo Tanaka | 1984-04-17 |
| 4366284 | Aqueously-swelling water stopper and a process of stopping water thereby | Hideo Tanaka | 1982-12-28 |