High pressure electric discharge lamp employing a metal spiral with positive potential
US4491766A · kind A · utility
11Cited by
16References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1982 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | Jun 24, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high intensity discharge lamp, for example a high pressure sodium or sodium halide lamp, which utilizes a refractory metal spiral with positive electric potential applied to it positioned around the arc tube to aid in starting and inhibit sodium migration through the arc tube during operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.