Universal burning ceramic lamp
US4342938A · kind A · utility
7Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1980 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Mar 31, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high pressure alkali metal vapor lamp envelope of alumina ceramic has an externally projecting metal tube serving as an inlead and as a reservoir for excess sodium-mercury amalgam. The ability of the lamp to withstand heavy vibration without the occurrence of voltage rise and drop-out caused by expulsion of amalgam droplets from the reservoir is enhanced by flattening the end portion of the metal tube to a least dimension adequate to increase the capillary attraction to better than twice the force of gravity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.