Issued Patents All Time
Showing 51–54 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4273683 | Oxide cathode and process for production thereof | — | 1981-06-16 |
| 4251746 | Direct-heated cathode structure | Yukihiro Izumida, Hiroshi Fukushima, Takeo Takemoto, Masaru Nakazawa, Tetsuo Kumazawa | 1981-02-17 |
| 4220891 | Directly heated cathode for electron tube | Hisashi Ando, Ko Soeno, Hiroshi Sakamoto, Testuo Oyama, Hiroshi Fukushima | 1980-09-02 |
| 4213030 | Silicon-semiconductor-type thermal head | Kokichi Ishibitsu | 1980-07-15 |