Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1977-06-01
1981-02-10
Albritton, C. L.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
252510, 219528, 219549, 219212, 219527, 338225, 338223, H05B 300
Patent
active
042503973
ABSTRACT:
The heating element includes a flexible graphite fiber-loaded impregnated paper saturated with a binder to ensure and maintain intimate electrical contact between the graphite fibers. In one form, two segments of the graphite fiber-loaded paper are coupled in series through a common bus bar and are electrically coupled to an SCR control circuit using a thermistor as a temperature responsive device. The graphite fiber-loaded paper with thermistor and electrical leads are encapsulated between cover sheets to provide an extremely thin highly flexible drapable therapeutic heating pad. Another form of heating pad includes providing the graphite fiber-loaded paper in the form of strips bonded to a plastic substrate. Electrical leads are attached and the substrate is enclosed by a cover sheet to provide a highly flexible heating pad. Two discrete methods of forming the latter heating pad are disclosed including silk screening and die pressing operations.
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Freeborn John O.
Gray Geoffrey I.
Albritton C. L.
International Paper Company
Roskoski Bernard
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