H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 3/10 (2006.01) H05B 3/14 (2006.01) H05B 3/84 (2006.01)
Patent
CA 2296875
The heater is formed from a substrate layer, a feeder buss layer, a dielectric layer, a PTF (polymer thick film) conductor or main buss layer, a PTC (positive temperature coefficient) thermistor layer and an external laminated adhesive layer. All of the layers are substantially coextensive. The feeder buss layer, dielectric layer, main buss layer and PTC thermistor layers are preferably screen printed or otherwise selectively applied. The feeder buss layer includes first and second external electrical terminals formed on a single side thereof, and a buss for providing electrical communication from the first terminal to a connector diagonally removed from the second terminal. The connector and the second terminal provide electrical communication to diagonally opposed corners of the PTF conductor or main buss layer thereby providing relatively uniform current path distances through the thermistor layer.
Finlayson & Singlehurst
Illinois Tool Works Inc.
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