Electric resistance heating devices – Heating devices – Radiant heater
Reexamination Certificate
2005-12-27
2005-12-27
Evans, Robin O. (Department: 3742)
Electric resistance heating devices
Heating devices
Radiant heater
C392S411000, C313S315000, C219S534000
Reexamination Certificate
active
06980734
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.
Evans Robin O.
Fastovsky Leonid M.
Knobbe Martens Olson & Bear LLP
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