Direct heating cathode and a process for manufacturing same
US4577134A · kind A · utility
6Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 12, 1982 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Jan 12, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides a direct heating thermo-electronic emission cathode comprising a pyrolytic graphite support and an emissive coating formed of a mixture of tungsten and lanthanum oxide, the tungsten being transformed in its surface part into tungsten hermicarbide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.