Electric lamp and discharge devices – With support and/or spacing structure for electrode and/or... – For filament
Reexamination Certificate
2005-02-15
2005-02-15
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
With support and/or spacing structure for electrode and/or...
For filament
C313S271000, C313S578000
Reexamination Certificate
active
06856078
ABSTRACT:
An improved support is provided for locating a lamp filament axially within a lamp sleeve. The illustrated support is a spiral coil that includes a small diameter center portion that makes contact with the filament. On either side of the filament-contacting portion, the coil opens up to larger diameters for contacting the inner wall of the quartz sleeve within which the filament is housed. The support thus appears H-shaped when viewed from the side. A lamp filament is also provided with expansion compensation sections at either end of a central section. The filament wire in the compensation sections is wound into coils having a greater diameter and also a greater spacing between windings, as compared to coil in the central section. The expansion compensation sections are preferably capable of compressing and thereby absorbing thermal expansion of the filament during operation, without shorting the filament across adjacent windings.
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ASM America Inc.
Knobbe Martens & Olson Bear LLP.
Williams Joseph
LandOfFree
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