Electric heating – Heating devices – With heating unit structure
Patent
1974-09-17
1976-01-20
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219549, 252511, 338211, H05B 316
Patent
active
039341194
ABSTRACT:
An electrical resistance heater on a metal substrate. Bonded to a surface of the substrate is an insulating layer of a cured polyimide or polyamide-imide resin. A second layer of a cured polyimide or polyamide-imide resin having dispersed therein at least approximately 60% by weight of graphite flakes is bonded to the insulating layer. Intermediate and bonded to a portion of the insulating layer and an opposing portion of the second layer is an electrically conductive stripe which provides a high conductivity path to interconnect the second layer to an external electrical circuit. The stripe is formed from a cured polyimide or polyamide-imide resin having dispersed therein flakes of a conductive metal. The layers are flexible and the second layer and stripe have electrical conductivities which are not substantially degraded during operation at temperatures of at least 200.degree.C. for extended periods of time.
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Baumann Russell E.
Haug John A.
Mayewsky Volodymyr Y.
McAndrews James P.
Texas Instruments Incorporated
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