Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806822 | Cathode ray tube containing zinc silicate phosphor | Tsutomu Ishii, Mitsuhiro Oikawa | 1989-02-21 |
| 4804882 | Cathode-ray tube including a white phosphor screen | Mitsuhiro Oikawa, Yoshinori Tetsuishi, Kazuaki Higuchi, Masaaki Tamatani | 1989-02-14 |