Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7279024 | High purity cobalt, method of manufacturing thereof, and high purity cobalt targets | Norio Yokoyama, Tamas Kekesi, Minoru Isshiki | 2007-10-09 |
| 6740290 | High purity cobalt, method of manufacturing thereof, and high purity cobalt targets | Norio Yokoyama, Tamas Kekesi, Minoru Isshiki | 2004-05-25 |
| 6391081 | Metal purification method and metal refinement method | Norio Yokoyama, Minoru Isshiki, Kouji Mimura | 2002-05-21 |