Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6388038 | Method for producing polycarboxylic acid for cement dispersant and cement composition | Tsuyoshi Hirata, Tsutomu Yuasa, Katsuhisa Shiote, Syogo Iwai | 2002-05-14 |
| 6384141 | Anti-shrinkage agent for hydraulic material | Tsuyoshi Hirata | 2002-05-07 |