Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4366284 | Aqueously-swelling water stopper and a process of stopping water thereby | Hideo Tanaka | 1982-12-28 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4366284 | Aqueously-swelling water stopper and a process of stopping water thereby | Hideo Tanaka | 1982-12-28 |