Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849282 | Prestressing steel material | Kanji Watanabe | 1989-07-18 |
| 4661387 | Steel materials for use with prestressed concrete | Kanji Watanabe | 1987-04-28 |
| 4643929 | Steel materials for use with prestressed concrete | Kanji Watanabe, Eiji Inoo | 1987-02-17 |