Lamp filament
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United States of America Patent
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Jun 2, 2009
Grant Date -
Jan 24, 2008
app pub date -
May 17, 2006
filing date -
May 17, 2006
priority date (Note) -
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Abstract
A base-up incandescent lamp (10) includes a coiled-coil filament (14) that has a primary wire (18) and a secondary wire (16), the primary wire (18) comprising an overwind that overlies the secondary wire (16) and provides a lower filament temperature and, therefore, less filament sag and a concomitant longer lamp life.
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