Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5216320 | Cathode for electron tube | Sachio Koizumi, Hiroshi Takanobu | 1993-06-01 |
| 4855637 | Oxidation resistant impregnated cathode | Isato Watanabe, Shigehiko Yamamoto, Susumu Sasaki | 1989-08-08 |
| 4783613 | Impregnated cathode | Shigehiko Yamamoto, Isato Watanabe, Susumu Sasaki | 1988-11-08 |
| 4737679 | Impregnated cathode | Shigehiko Yamamoto, Toshiyuki Aida, Isato Watanabe, Susumu Kawase | 1988-04-12 |
| 4626470 | Impregnated cathode | Shigehiko Yamamoto, Toshiyuki Aida | 1986-12-02 |
| 4518890 | Impregnated cathode | Toshiyuki Aida, Shigehiko Yamamoto, Yukio Honda | 1985-05-21 |
| 4400648 | Impregnated cathode | Yukio Honda, Toshiyuki Aida, Ushio Kawabe | 1983-08-23 |
| 4291252 | Electron tube cathode | Toshiyuki Aida, Shigehiko Yamamoto, Isamu Yuito, Yukio Honda, Ushio Kawabe +4 more | 1981-09-22 |
| 4260665 | Electron tube cathode and method for producing the same | Toshiyuki Aida, Isamu Yuito, Ushio Kawabe, Shigehiko Yamamoto, Yukio Honda +2 more | 1981-04-07 |