Cathode for electron tube
US4924137A · kind A · utility
23Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Feb 8, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An oxide-coated cathode for an electron tube comprises a layer (2) of an electron-emissive substance. This layer (2) contains: an alkaline earth metal oxide as a principal component containing at least Ba; an oxide of Sc; and at least one heat-resisting oxide selected from the group consisting of oxides of Al, Si, Ta, V, Cr, Fe, Zr, Nb, Hf, Ta, Mo and W.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.