Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4334921 | Converter steelmaking process | Masazumi Hirai, Kazuo Okohira, Hajime Nakagawa | 1982-06-15 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4334921 | Converter steelmaking process | Masazumi Hirai, Kazuo Okohira, Hajime Nakagawa | 1982-06-15 |