Cathode for electron tube
US4797593A · kind A · utility
32Cited by
12References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1986 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Jul 17, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention is a cathode of an indirect heated type having improved electron emission characteristics. A cathode for an electron tube in accordance with the present invention comprises: a base containing Ni as a major element; and a layer of an electron-emissive substance formed on the base, this layer comprising not only alkaline earth metal oxide as a principal component containing at least Ba, but also rare earth metal oxide of 0.1 to 20 wt. % or rare earth metal of 0.05 to 15 wt. %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.