Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4450005 | Metal refining method | Yasuyuki Nakao, Yosuke Hoshijima | 1984-05-22 |
| 4334921 | Converter steelmaking process | Masazumi Hirai, Shozo Murakami, Hajime Nakagawa | 1982-06-15 |