Electric heating – Heating devices – With heating unit structure
Patent
1988-02-24
1993-01-05
Lateef, Marvin M.
Electric heating
Heating devices
With heating unit structure
219468, 219445, 219446, 392438, 338307, 338308, 338292, H05B 316
Patent
active
051773414
ABSTRACT:
In a thick film water track, irrespective of track thickness or the material of which the track is constructed, the optimum track width is found to be in the range of from 1.2 mm to 2.1 mm. Further, for a given resistance, the track is longer and may be conformed to a pattern to give improved temperature distribution. Additionally disclosed is a heating element having a number of thick film electrically resistive tracks applied to the surface of an electrically insulative substrate and a switch for selectively connecting one or more of the tracks to a power supply. The resistance and hence the operating temperature of the heating element may be varied by changing the track or tracks connected to the switch.
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Lateef Marvin M.
Thorn Emi plc
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