High-brightness, long life thermionic cathode and methods of its fabrication
US9165737B2 · kind B2 · utility
5Cited by
0References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2012 |
| Grant date | Oct 20, 2015 |
| Priority date | — |
| Expiry date | Jan 7, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/06308
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved cathode comprises a cone-shaped emitter with a carbon-based coating applied to the emitter cone surface, in which there is a narrow annular gap between the emitter body and the carbon coating. The gap prevents direct contact between the carbon coating and the crystalline emitting material, thereby preventing damaging interactions and extending the useful lifetime of the cathode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.