Tungsten halogen lamp including phosphorous and bromine
US5034656A · kind A · utility
7Cited by
6References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Sep 26, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Tungsten-halogen lamps operating at temperatures above 250.degree. C. which contain a mixture of phosphine, hydrogen, bromine and inert gas have been found to have superior life and lumen maintenance when the atomic ratio of phosphorus to bromine in the lamp is in the range of from 0.4-2.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.