Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873120 | Method of manufacturing cathode-ray tube | Takeo Itou, Hidemi Matsuda, Osamu Yagi | 1989-10-10 |
| 4806329 | Method of producing granular synthetic silica | Toshitsura Cho | 1989-02-21 |