Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6630020 | Cement additive, and concrete composition and structure both containing the same | Yoshihide Shimoyama, Takashi Ayata, Satoshi Tanaka | 2003-10-07 |
| 5181961 | Cement composition | Yasuhide Umaki, Rokuro Tomita, Shigeru Okada | 1993-01-26 |