Electric resistance heater
OwnerFrederick G. J. Grise, John A. Martstiller +1inventors
InventorsFrederick G. J. Grise, John A. Martstiller, Paul H. Bodensiek
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Abstract
An electrical heater including a semi-conductor pattern (e.g., colloidal graphite ink) printed on a substrate. A conductive ink (e.g., a silver ink) is deposited on the semi-conductor pattern. The conductive ink migrates into the semi-conductor material, provides a superior electrical contact between the conductor (e.g., the silver ink) and the underlying semi-conductor material (e.g., the semi-conductor graphite ink), and essentially eliminates interface resistance. In some embodiments, the semi-conductor pattern is printed on one side of a woven cloth substrate and the conductive ink is printed on the other side.
Claims11
An electrical heating device comprising:
- (a) a substrate having at least one electrically insulating surface;
- (b) a semi-conductor pattern comprising a semi-conductor ink deposited on said electrically insulating surface, said pattern including a pair of spaced-apart conductor contact portions and a heating portion extending between and electrically connected to said conductor contact portions;
- and,
- (c) a pair of conductors, each of said conductors having a resistance less than that of said heating and conductor contact portions and being in direct electrical engagement with one of said conductor contact portions,
- said heating device being characterized in that each of said conductors comprises a conductive ink deposited in registration with said conductor contact portions after said semi-conductor ink has been deposited on said substrate to provide said semi-conductor pattern, and in that said conductive ink migrates into said conductor contact portions.
Dependencies are inferred from the claim text.