Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5000427 | Injection material for use in blast furnace | Takeshi Iba, Junji Kariya, Yoshichika Yanagibashi, Masaaki Koba, Akira Watanabe +2 more | 1991-03-19 |
| 4431745 | Carbon-bonded magnesia carbon bricks | Akira Watanabe, Goji Saeki | 1984-02-14 |