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, Hiroshi Fukushima | 1982-09-14 |
| 4313854 | Oxide-coated cathode for electron tube | Kazuo Sunahara | 1982-02-02 |