Electric heating pad
First Claim
1. An electric heating pad comprising:
- a. a flexible heating element, comprising two independent thin film semiconductor circuits printed on an electrically insulating surface and laminated between overlying and underlying organic polyester sheets;
b. means for electrically connecting said heating element to an external power source;
c. two outer organic polymer sheets, one sheet disposed on each side of the heating element, with the outer edges of the polymer sheets in contact with each other; and
d. means to seal the outer edges of the polymer sheets together to hermetically seal the heating element therebetween.
6 Assignments
0 Petitions
Accused Products
Abstract
The improved heating pad includes a flexible, thin film heating element with two independent semiconductor circuits printed on an electrically insulating surface, laminated between overlying and underlying organic polyester sheets, and electrically connected to an external power source, wherein the heating element is hermetically sealed in an outer organic polymer covering. Thermostats are positioned directly over the semiconductive circuit traces. The circuit traces are connected in parallel by a multi-position switch, with each circuit capable of being energized separately or in combination, and each circuit capable of providing heat over the entire area of the pad. A circuit protective device provides a varistor across the power supply and a fast-acting fuse in series with the circuit traces.
120 Citations
25 Claims
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1. An electric heating pad comprising:
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a. a flexible heating element, comprising two independent thin film semiconductor circuits printed on an electrically insulating surface and laminated between overlying and underlying organic polyester sheets; b. means for electrically connecting said heating element to an external power source; c. two outer organic polymer sheets, one sheet disposed on each side of the heating element, with the outer edges of the polymer sheets in contact with each other; and d. means to seal the outer edges of the polymer sheets together to hermetically seal the heating element therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification