Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4349766 | Directly heated cathode for electron tube | Hisashi Ando, Ko Soeno, Hiroshi Sakamoto, Akira Misumi | 1982-09-14 |
| 4310777 | Directly heated cathode for electron tube | Ko Soeno, Hisashi Ando, Shigehiko Yamamoto, Toshiyuki Aida | 1982-01-12 |