Hot cathode, its production process and electron tube incorporating such a cathode
US4393328A · kind A · utility
3Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1980 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Nov 5, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J23/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The hot cathode, according to the invention, is constituted by a fritted matrix 1 and a heating filament 4, said matrix being formed from a powder mixture 2 of tungsten and another high work function refractory metal and covered with a high work function refractory metal film 3. FIG. 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.