Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1989-12-13
1992-07-07
Reynolds, Bruce A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219387, 219541, 219542, 219552, 338195, F27D 1100, H05B 300, H01C 1000
Patent
active
051285223
ABSTRACT:
An improved heaterboard, and method and apparatus for producing same is disclosed herein. A foil layer is bonded to a paperboard substrate and a circuit path is cut in the foil layer to define a heating circuit. In a preferred method, the circuit is defined by cut scores and short-circuiting across the cut scores is prevented by a reverse scoring operation in which the circuit pattern is scored in the surface of the heaterboard opposite the surface having the foil heating layer thereon. Various heaterboard circuit patterns and an apparatus for forming heaterboards are also disclosed.
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Cheshire James O.
Marx Ronald P.
James River Corporation of Virginia
Reynolds Bruce A.
To Tuan Vinh
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