Title: Electrical resistance heaters

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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Inventors: Trenkler, George (East Providence, RI, US)

Application Number: 506680
Filing Date: 1974-09-17
Publication_date: 1976-01-20
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Class(es): 219/543 219/549, 252/511, 338/211
Other Classes:
US Patent Ref:

2475379	Jul, 1949	Stong	219/543.
2559077	Jul, 1951	Johnson et al.	219/543.
2624823	Jan, 1953	Lytle	219/543.
2682483	Jun, 1954	Erbe	219/549.
2853589	Sep, 1958	Crooke	219/543.
2859321	Nov, 1958	Garaway	219/543.
2961522	Nov, 1960	Hammer	219/543.
3387248	Jun, 1968	Rees	338/211.
3444183	May, 1969	Hubbuch	252/511.
3491056	Jan, 1970	Saunders	252/511.

Other Refs:
Primary Examiner: Mayewsky, Volodymyr Y.
Assistant Examiner:
Attorney: McAndrews; James P., Haug; John A., Baumann; Russell E.