Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820954 | Indirectly heated cathode structure for electron tubes | Sakae Kimura, Mituo Kawai | 1989-04-11 |
| 4524296 | Cathode structure for electron tube | Shouji Nakayama, Yukio Takanashi, Toshiharu Higuchi | 1985-06-18 |