Tungsten halogen lamp
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United States of America Patent
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-
Oct 20, 1992
Grant Date -
N/A
app pub date -
Nov 13, 1990
filing date -
Nov 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tungsten halogen lamp producing infra red radiation, for example for cooking or heating, has an envelope of high silica content material sealed at each end by a pinch seal. A gas fill is at a room temperature pressure of 250-750 mm Hg. A portion of the envelope at each end is clear and the rest contains an opacifier which reduces transmission of visible light. A suitable opacifier is red, being produced by the reduction of copper oxide dispersed in the high silica content material. The envelope is produced by butt joining clear end sections and a tube of material containing opacifier.
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Cited Art Landscape
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