Traffic lamp and filaments therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
N/A
Issued Date -
Jun 13, 2002
app pub date -
Dec 8, 2000
filing date -
Dec 8, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A traffic lamp has a helical coil filament arranged in a pattern with no angles or sharp bends and with each convolution of the coil substantially tangent to the focal plane of the lamp. The filament may be generally in the pattern of the lower case Greek letter Omega and is supported on seven support wires, so that the same filament length can be used for both 120-volt and 240-volt applications. In one embodiment, the lamp has two filaments arranged as arcs of a common circle lying substantially in the focal plane, each arc being supported on three support wires, the filaments being respectively connected in series with diodes so that the filaments respectively conduct on alternate half cycles of the AC source voltage.
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Family
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Cited Art Landscape
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