Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6475450 | Method of leaching zinc concentrate | Kaoru Saruta, Hitoshi Masuda | 2002-11-05 |
| 5824282 | Method of sulfur purification | Hideki Nagata, Shuji Kuramochi | 1998-10-20 |
| 5656251 | Method of sulfur purification | Hideki Nagata, Shuji Kuramochi | 1997-08-12 |