Thermionic wick electrode for discharge lamps
US3988629A · kind A · utility
12Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1974 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | Oct 7, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved electrode particularly suitable for operation at high current densities in vapor discharge lamps in which the pressure is upwards of 1 atmosphere. It comprises a porous matrix of refractory metal impregnated with a glassy emission material which becomes fluid or produces a fluid component at the operating temperature. The emission material comprises a low work function metal oxide and a glass forming component, preferred emission materials being lanthanum borate and lanthanum silicate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.