Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5329740 | Concrete repairing agent injection plug | Yuichiro Hayashi | 1994-07-19 |
| 5309692 | Method for injecting repairing agent into concrete construction | Yuichiro Hayashi, Osamu Ito | 1994-05-10 |