Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4591754 | Electron gun for brightness | Hirotoshi Hagiwara, Masaji Ishii | 1986-05-27 |
| 4482838 | Thermionic emission cathode | Masaji Ishii, Hirotoshi Hagiwara | 1984-11-13 |
| 4311941 | Thermionic cathode supporting device | Masaru Amemiya, Hirotoshi Hagiwara | 1982-01-19 |