Tungsten-fluorine lamp with native retained oxygen therein and method of manufacture
US4005324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1976 |
| Grant date | Jan 25, 1977 |
| Priority date | — |
| Expiry date | Mar 17, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K1/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tungsten fluorine lamp is manufactured by a process including the steps of forming a glass bulb and tungsten filament-lead set to have a controlled content of native oxygen thereon; locating and sealing the tungsten filament and lead set in the bulb and thereafter by a simplified three-step process of evacuation, gas fill and bulb tubulation tip seal step forming a completed lamp assembly; and wherein the completed lamp assembly includes a gas fill comprising an inert component at six atmospheres and a fluorinated hydrocarbon component of only carbon, bromine and fluorine with a range of 3.2 .times. 10.sup.-.sup.7 to 8 .times. 10.sup.-.sup.7 gram atoms of carbon, 2.1 .times. 10.sup.-.sup.6 to 5.2 .times. 10.sup.-.sup.6 gram atoms of bromine, and 1.5 .times. 10.sup.-.sup.6 to 3.8 .times. 10.sup.-.sup.6 gram atoms of fluorine and an oxygen content (evolved from the aforesaid native oxygen) of 1.3 .times. 10.sup.-.sup.6 to 3.3 .times. 10.sup.-.sup.6 gram atoms (all per cc of lamp assembly gas volume) thereby to produce a controlled equimolar relationship of fluorine and oxygen for stable tungsten fluorine oxygen cycle operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.