HID lamp electrode comprising barium (yttrium or rare earth metal) tungstate or molybdate
US4152619A · kind A · utility
6Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1977 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Oct 26, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/0737
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
For HID lamps, and particularly high-pressure mercury or sodium-mercury HID lamps, the electron-emissive material portion of the lamp electrodes is M.sub.3 M'.sub.2 M"O.sub.9 wherein M is alkaline-earth metal and at least principally comprises barium; M' is yttrium, a lanthanoid series metal, or any mixtures thereof; and M" is tungsten, molybdenum, or mixtures thereof. The specified material is very stable and highly emissive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.