Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6835230 | Method for leaching zinc concentrate | Manabu Kanno, Yoshiyuki Watanabe, Akira Narumi | 2004-12-28 |
| 6696037 | Method of recovering sulfur from minerals and other sulfur-containing compounds | Yoshiyuki Watanabe, Toyohisa Fujita | 2004-02-24 |
| 6475450 | Method of leaching zinc concentrate | Norihito Ishimori, Hitoshi Masuda | 2002-11-05 |