HID Lamp electrode comprising barium-calcium niobate or tantalate
US4321503A · kind A · utility
4Cited by
8References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1978 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Nov 6, 1998 |
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 Ba.sub.3 CaM.sub.2 O.sub.9 wherein M is niobium, tantalum or any combinations thereof. The specified material is highly emissive, very refractory, and essentially completely non-reactive with respect to moisture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.