Patent · US Expired

Halogen incandescent lamp with single halogenated hydrocarbon fill component

US4777404A · kind A · utility

6Cited by

2References

13Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Rolf Kiesel · Aalen, DE
Karl-Heinz Blum · Söhnstetten, DE

Key dates

Filing date	Mar 18, 1987
Grant date	Oct 11, 1988
Priority date	—
Expiry date	Mar 18, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/00
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To prevent carburation of a tungsten filament, the fill within the bulb is ormed by an inert gas, for example xenon or krypton, and an additive which is formed by a single halogenated hydrocarbon in which iodine is bound, and further includes at least one atom of bromine or chlorine; suitable additives are: CH.sub.2 ClI, CHCl.sub.2 I, CHClI.sub.2, CHClBrI, CH.sub.2 BrI, present in from between about 1.times.10.sup.-8 to 5.times.10.sup.-6 mol per cm.sup.3 of the internal volume of the bulb; particularly preferred are chlor iodine methane (CH.sub.2 ClI), present in about 1-3.times.10.sup.-7 mol per cm.sup.3 of the internal volume of the bulb.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.