Heating element for indirectly heated cathode and method for the manufacture of such an element
US4427916A · kind A · utility
4Cited by
8References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1980 |
| Grant date | Jan 24, 1984 |
| Priority date | — |
| Expiry date | Feb 9, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This heating element is constituted by a filament and a mixture, fritted at between 1700.degree. and 1800.degree. C., of alumina and less than 10% by weight of yttrium oxide. This mixture fills the space left free by the filament within the cylinder closed by an emissive disk forming the cathode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.