Heating element and method for the manufacture thereof
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United States of America Patent
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Feb 28, 1989
Grant Date -
N/A
app pub date -
Jun 5, 1987
filing date -
Jun 6, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a heating element and to a method for the manufure thereof. The heating element comprises (1) at least one electrically insulating support sheet, preferably a sheet made of mica or of glass, which is stable at the temperature of use of the element, (2) an electrically conductive layer applied on one face of the support sheet and consisting of a thermohardened synthetic resin which is stable up to a temperature of about 500.degree. C. and in which particles of carbon black are dispersed so as to cause the resin layer to be electrically conductive, and (3) two metallic conductors in contact with said layer and parallel to each other, said metallic conductors being intended to be connected to a source of electric power. The method for manufacturing the heating element comprises the steps of (1) coating a face of an electrically insulating support layer which is stable at the temperature of use, with an electrically conductive layer of a resin which is soluble in organic solvent(s) and which is stable up to a temperature of about 500.degree. C. and in which particles of carbon black are dispersed and (2) connecting to said layer of resin two metallic conductors which are substantially parallel to each other.
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