Process for manufacturing incandescent lamps having gettering agents
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United States of America Patent
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Sep 1, 1998
Grant Date -
N/A
app pub date -
Feb 27, 1996
filing date -
Feb 27, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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