Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5665133 | Process for production of pure transparent quartz | Yukinobu Hara, Tomoyuki Akiyama, Koji Tsukuma, Yoshikazu Kikuchi | 1997-09-09 |
| 5202104 | Process for preparing silica having a low silanol content | Naotake Watanabe, Junsuke Yagi, Iwao Ohshima | 1993-04-13 |
| 5154905 | Method for producing unsintered cristobalite particles | Iwao Ohshima, Naotake Watanabe, Yasumasa Yamaguchi | 1992-10-13 |
| 5028360 | Method of manufacturing spherical silica particles | Yuziro Ito, Takashi Higashiogawa, Masahiro Matsuura, Yasumasa Yamaguchi | 1991-07-02 |
| 4853198 | Process for producing unsintered cristobalite silica | Iwao Ohshima, Naotake Watanabe | 1989-08-01 |
| 4683128 | Process for manufacturing high purity silica | Masashi Nishida, Junsuke Yagi, Iwao Ohshima | 1987-07-28 |