Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4776161 | Unbonded PC steel strand | Syuzo Sato, Masamitsu Takei | 1988-10-11 |
| 4635433 | Unbonded PC steel strand | Masamitsu Takei | 1987-01-13 |
| 4272210 | Interchange system | Sanae Shoji | 1981-06-09 |
| 4189130 | Blast-furnace tuyere | Hideto Watanabe, Akimune Sato, Takashi Oka | 1980-02-19 |