Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9512504 | Method for producing sodium tungstate, method for collecting tungsten, apparatus for producing sodium tungstate, and method for producing sodium tungstate aqueous solution | Yoshiharu Yamamoto, Kazuo Sasaya, Takayuki Fudo, Akira Nakano, Syunsuke Yamanaka +2 more | 2016-12-06 |
| 9249479 | Method for producing sodium tungstate, method for collecting tungsten, apparatus for producing sodium tungstate, and method for producing sodium tungstate aqueous solution | Yoshiharu Yamamoto, Kazuo Sasaya, Takayuki Fudo, Akira Nakano, Syunsuke Yamanaka +2 more | 2016-02-02 |
| 8974674 | Method for producing ammonium tungstate aqueous solution | Hideaki Ito, Takeshi Itakura, Yoshiharu Yamamoto, Kazuo Sasaya, Takuya Okuno +2 more | 2015-03-10 |
| 8632747 | Method for producing sodium tungstate, method for collecting tungsten, apparatus for producing sodium tungstate, and method for producing sodium tungstate aqueous solution | Yoshiharu Yamamoto, Kazuo Sasaya, Takayuki Fudo, Akira Nakano, Syunsuke Yamanaka +2 more | 2014-01-21 |