Method of making incandescent lamp

Details Method of making incandescent lamp Method of making incandescent lamp

1975-04-21

1976-11-02

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 115F, 148 203, 148133, 140 715, 427111, H01K 108

Patent

active

039895491

ABSTRACT:
The coiled tungsten filament of an incandescent lamp is made more resistant to sagging by exposing the filament to a vaporized phosphorus atmosphere so as to form tungsten monophosphide on the filament. The filament is subsequently heated in order to dissociate the tungsten monophosphide and evaporate the phosphorus therefrom.

REFERENCES:
patent: 1017280 (1912-02-01), von Bolton
patent: 1086171 (1914-02-01), Henderson
patent: 1605192 (1926-11-01), McAllister
patent: 3662789 (1972-05-01), Koo et al.

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