Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828619 | Air-entraining agent for flyash cement composition | Souji Matsushita, Setsuro Shimizu, Susumi Tahara | 1989-05-09 |
| 4808641 | Concrete admixture | Hideo Yagi | 1989-02-28 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828619 | Air-entraining agent for flyash cement composition | Souji Matsushita, Setsuro Shimizu, Susumi Tahara | 1989-05-09 |
| 4808641 | Concrete admixture | Hideo Yagi | 1989-02-28 |