Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886995 | Heater for indirectly-heated cathode | Hiroshi Takakura | 1989-12-12 |
| 4844942 | Method of producing dark heater | Terutoshi Ichihara | 1989-07-04 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886995 | Heater for indirectly-heated cathode | Hiroshi Takakura | 1989-12-12 |
| 4844942 | Method of producing dark heater | Terutoshi Ichihara | 1989-07-04 |