Electric heating – Heating devices – With heating unit structure
Reexamination Certificate
2006-06-20
2006-06-20
Fuqua, Shawntina (Department: 3742)
Electric heating
Heating devices
With heating unit structure
C219S549000, C219S523000, C219S541000, C219S542000, C219S535000, C219S548000, C219S424000
Reexamination Certificate
active
07064303
ABSTRACT:
A tubular heater that is manually bendable to fit into a channel comprises a heating element positioned in an insulative material such as magnesium oxide and encased in a continuous inner nickel tubular sheathing. An outer sheathing, in a preferred embodiment, comprises a coil of copper with a nickel coating swaged such that the cross-section of a strand of the coil is generally rectangular. The invention also includes the method of manufacturing and method of use of the tubular heater. Alternate embodiments include an outer tubular sheath that has a multiplicity of slits extending in a circumferential direction through the outer sheathing and the outer sheathing swaged directly on the inner sheathing. A further embodiment includes the outer tubular sheathing formed from a multiplicity of individual rings, the outer sheath could be swaged directly on the inner sheath.
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Fuqua Shawntina
Patterson Thuente Skaar & Christensen P.A.
Thermetic Products, Inc.
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