Thick film electrically resistive tracks
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United States of America Patent
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-
Jan 5, 1993
Grant Date -
N/A
app pub date -
Feb 24, 1988
filing date -
Feb 25, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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