Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8747787 | Method for producing raw material for ferronickel smelting from low grade nickel oxide ore | Hiroshi Kobayashi, Keisuke Shibayama, Takayuki Nakai, Yoshitomo Ozaki, Norihisa Toki +2 more | 2014-06-10 |
| 8343447 | Hydrometallurgical process for a nickel oxide ore | Keisuke Shibayama, Yoshitomo Ozaki | 2013-01-01 |
| 7964165 | Separation method for zinc sulfide | Yoshitomo Ozaki, Keisuke Shibayama, Takao Ooishi, Satoshi Matsumoto | 2011-06-21 |
| 6519836 | Bolt press fit apparatus | Toshihiro Watanabe | 2003-02-18 |
| 6463781 | System for drawing outer cylinder of rubber bush | Toshihiro Watanabe | 2002-10-15 |
| 4294428 | Butterfly valve | Yoshitsugu Okada | 1981-10-13 |
| 4273308 | Rotary valve | — | 1981-06-16 |