Process of manufacturing a tungsten lamp filament

Details Process of manufacturing a tungsten lamp filament Process of manufacturing a tungsten lamp filament

1978-08-28

1981-09-29

Combs, Ervin M.

Metal working

Barrier layer or semiconductor device making

Barrier layer device making

29 2518, 29424, 140 715, B21F 304, B21F 4500

Patent

active

042914442

ABSTRACT:
An electric lamp filament of tungsten is disclosed that has been coiled and heat-treated to at least 1600.degree. C. on a wire mandrel containing molybdenum but which is essentially free of molybdenum contamination. A barrier layer of tungsten or tantalum is provided on said mandrel to preclude the molybdenum contamination and the coated mandrel can thereafter be dissolved from the uncontaminated tungsten filament coil in an acid mixture.

REFERENCES:
patent: 2723926 (1955-11-01), Bellott
patent: 3285293 (1966-11-01), Matheson
patent: 3461921 (1969-08-01), Ackerman
patent: 3662789 (1972-05-01), Koo et al.
patent: 3812393 (1974-05-01), Koo et al.
patent: 3865074 (1975-02-01), Cornelissen et al.
patent: 3877495 (1975-04-01), Koo et al.
patent: 4049024 (1977-09-01), Auborn et al.

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