Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887800 | Tuyere of blast furnace | Hirohisa Hotta, Yotaro Ono | 1989-12-19 |
| 4844737 | Method for operating a blast furnance by blowing pulverized coal | Yotaro Oono, Hiroshi Saito, Takehiko Miyamoto, Kazumasa Wakimoto, Hitoshi Kawada | 1989-07-04 |