Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4328030 | Steel making process and apparatus | Yasuyuki Tozaki, Minoru Ueda, Takeyuki Hirata | 1982-05-04 |
| 4292073 | Steel making process | Katsukiyo Marukawa, Seiichi Masuda | 1981-09-29 |
| 4280838 | Production of carbon steel and low-alloy steel with bottom blowing basic oxygen furnace | Katsukiyo Marukawa, Isao Yamazaki, Tsutomu Kajimoto | 1981-07-28 |