Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5788920 | Oxygen blowing lance capable of being used in an electric furnace | Hiroshi Okamoto | 1998-08-04 |
| 5410564 | Direct current electric furnace for melting metal | Koji Numata, Shunji Ohtsubo | 1995-04-25 |
| 5177763 | Furnace bottom structure of direct current electric furnace | Hisakazu Mizota, Kiyoshi Takahashi | 1993-01-05 |
| 5011531 | Method and apparatus for degassing molten metal utilizing RH method | Kiyoshi Takahashi, Shinji Kojima, Haruji Okuda, Shigeru Ohmiya, Ryuichi Ikeda | 1991-04-30 |
| 4746103 | Lance for blow-refinement in converter | Shinji Kojima, Rinzo Tachibana, Takayasu Yamada, Fumiaki Yoshikawa | 1988-05-24 |