Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6492768 | Cathode ray tube having an improved indirectly heated cathode | Sachio Koizumi, Norio Iwamura | 2002-12-10 |
| 5038071 | Heater for indirectly-heated cathode | Sachio Koizumi, Toshio Kawashima | 1991-08-06 |
| 4844942 | Method of producing dark heater | Sachio Koizumi | 1989-07-04 |