Long life incandescent tungsten-halogen lamp
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United States of America Patent
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May 29, 1984
Grant Date -
N/A
app pub date -
Apr 28, 1982
filing date -
Apr 28, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Life expectancy, through reduction of filament sag and halogen corrosion of tungsten filaments, is greatly increased for tungsten-halogen lamps by including within the filament environment a quantity of copper. The copper can be present as one of the lead-in wires; a plating on the lead-in wires; a separate copper insert; or a coating on the filament. It is believed the copper acts as an oxygen getter.
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