Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4892586 | Concrete composition for roller compacted placing method | Yoshiharu Watanabe, Hisayuki Shimizu | 1990-01-09 |
| 4861378 | Cement additive containing superplasticizer and bentonite | Yoshiharu Watanabe, Hisayuki Shimizu, Hitoshi Moriyama | 1989-08-29 |