Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4220891 | Directly heated cathode for electron tube | Hisashi Ando, Ko Soeno, Hiroshi Sakamoto, Takao Kawamura, Hiroshi Fukushima | 1980-09-02 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4220891 | Directly heated cathode for electron tube | Hisashi Ando, Ko Soeno, Hiroshi Sakamoto, Takao Kawamura, Hiroshi Fukushima | 1980-09-02 |