Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883521 | Method for the preparation of silica glass | Syuji Tanaka | 1989-11-28 |
| 4842837 | Process for producing fine spherical silica | Toshihiro Okon | 1989-06-27 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883521 | Method for the preparation of silica glass | Syuji Tanaka | 1989-11-28 |
| 4842837 | Process for producing fine spherical silica | Toshihiro Okon | 1989-06-27 |