Triple walled lamp
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United States of America Patent
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Aug 30, 2011
Grant Date -
Jan 14, 2010
app pub date -
Jul 2, 2009
filing date -
Jul 4, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lamp in which an inner bulb containing a light emitting tube or a light emitting filament and an outer bulb containing the inner bulb are attached coaxially to a base, and a spacer made of a thin metal sheet is attached to an exhaust tube protruding from a central region at the top end of the inner bulb coaxially supporting the inner bulb to the outer bulb. The spacer has a central plate formed with an aperture allowing the exhaust tube to be inserted through the central plate, and a plurality of fingers protruding inward along the inner periphery of the aperture, and three or more strips, each branched radially outward from the central plate and formed in a curved shape coaxially supporting the inner bulb and the outer bulb.
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