Filament support for incandescent lamps
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United States of America Patent
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-
Apr 4, 1995
Issued Date -
N/A
app pub date -
Apr 7, 1994
filing date -
Mar 27, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An incandescent lamp containing a coiled filament within a vitreous envelope wherein the filament is supported at at least one point along its coil length by a refractory metal support wire one end of which is welded to a coil and the other end secured to the envelope wall by a glass bead. The support prevents filament sag during lamp operation and is especially useful with double-ended high intensity tungsten-halogen lamps having an elliptically shaped filament chamber with an infrared reflecting and visible light transmitting optical interference coating on the chamber.
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Cited Art Landscape
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