Halogen incandescent lamp with single halogenated hydrocarbon fi

Details Halogen incandescent lamp with single halogenated hydrocarbon fi Halogen incandescent lamp with single halogenated hydrocarbon fi

1987-03-18

1988-10-11

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

252372, H01K 150

Patent

active

047774045

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.

REFERENCES:
patent: 3551722 (1970-12-01), Holcomb et al.
patent: 3644773 (1972-02-01), Coaton et al.

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