Process for manufacturing incandescent lamps having gettering ag

Details Process for manufacturing incandescent lamps having gettering ag Process for manufacturing incandescent lamps having gettering ag

1996-02-27

1998-09-01

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

445 41, 427111, H01K 110, H01K 156, H01K 302

Patent

active

058002359

ABSTRACT:
Filaments having a thin exterior tungsten phosphide layer for use in incandescent lamps are made by exposing tungsten filaments to vapors of elemental phosphorous at approximately 675.degree. to 725.degree. C. in an evacuated vacuum furnace. The tungsten phosphide layer protects the filaments from oxidation while the lamps are manufactured, and decomposes to tungsten and phosphorous when the lamp is first energized by current. The resulting elemental phosphorous acts as a gettering agent.

REFERENCES:
patent: 3351407 (1967-11-01), Zarins
patent: 3475072 (1969-10-01), Graves
patent: 3785019 (1974-01-01), Chiola et al.
patent: 3989549 (1976-11-01), Cangiano et al.
patent: 4927398 (1990-05-01), Shaffer

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