Direct heating cathode for high frequency thermionic tube
US4429250A · kind A · utility
11Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1981 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Sep 18, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/15
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A direct heating thermionic emission cathode for high frequency tubes of the diode, tetrode or pentode type. It comprises a pyrolytic graphite support and a lanthanum hexaboride-based thermoemissive material, these elements being separated by a layer which constitutes a diffusion barrier and comprises a tantalum or hafnium carbide, a metal of the platinum group or a boron compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.