Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861378 | Cement additive containing superplasticizer and bentonite | Yoshiharu Watanabe, Hisayuki Shimizu, Mineo Ito | 1989-08-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861378 | Cement additive containing superplasticizer and bentonite | Yoshiharu Watanabe, Hisayuki Shimizu, Mineo Ito | 1989-08-29 |