Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8960444 | Method for separating arsenic mineral from copper-bearing material with high arsenic grade | Daishi Ochi, Hideyuki Okamoto, Yoshihisa Takahashi, Yuji Aoki, Shigeto Kuroiwa | 2015-02-24 |
| 5702591 | Flotation method for non-ferrous metal variable ores | Hideyuki Okamoto, Ryoichi Nakayama | 1997-12-30 |
| 4663279 | Method of beneficiation of complex sulfide ores | Hajime Nakazawa, Masayuki Hisatsune | 1987-05-05 |
| 4584107 | Method of treating effluents containing sulfur oxides | Takeo Odaka | 1986-04-22 |