Electrically resistive tracks

Details Electrically resistive tracks Electrically resistive tracks

1988-02-24

1989-08-22

Albritton, C. L.

Electric heating

Heating devices

With heating unit structure

29612, 219552, 219553, 338 25, 338308, H05B 316

Patent

active

048598356

ABSTRACT:
A heating element comprises an electrically resistive track intended to be formed on an electrically insulative substrate. A heating unit comprises a heating element and a temperature sensor on a substrate, the sensor comprising an electrically resistive track. The track consists of a thick film having in the temperature range of from 0.degree. C. to 550.degree. C. a temperature coefficient of resistance in excess of 0.006 per degree C. The thick film includes a metal and a glass in such proportions as to provide a suitable resistivity and a thermal expansion coefficient to match that of an electrically insulative substrate to which the track is to be applied and to permit adhesion of the track to the substrate.
The considerable variation of the resistance of the track with temperature provides advantages in both of the aforementioned applications.

REFERENCES:
patent: 3304199 (1967-02-01), Faber, Jr. et al.
patent: 3349722 (1967-10-01), Davis
patent: 3386165 (1968-06-01), Bruhl, Jr. et al.
patent: 3503030 (1970-03-01), Matsumoto et al.
patent: 3647532 (1972-03-01), Friedman et al.
patent: 4237442 (1980-12-01), Carter
patent: 4286377 (1981-09-01), Hurko et al.

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