Impregnated-type cathode substrate with large particle diameter low porosity region and small particle diameter high porosity region
US6447355B1 · kind B1 · utility
3Cited by
9References
4Claims
0Family size
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Key dates
| Filing date | Dec 17, 1999 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Dec 17, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2223/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided an impregnated-type cathode substrate comprising a large particle diameter low porosity region and a small particle diameter high porosity region which is provided in a side of an electron emission surface of the large particle diameter low porosity region and has an average particle diameter smaller than an average particle diameter of the large particle diameter low pore region and a porosity higher than a porosity of the large particle diameter low porosity region, the impregnated-type cathode being impregnated with an electron emission substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.