Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5316746 | High purity iron oxide and method for production hereof | Takero Ito, Shuetsu Ogasawara | 1994-05-31 |
| 4973462 | Process for producing high purity silica | Seki Akira, Shunroh Nagata | 1990-11-27 |
| 4676964 | Process for purifying silica | Akira Seki, Yoshio Aso, Shunro Nagata | 1987-06-30 |