Self-contained warming pad
First Claim
1. A self-contained warming pad comprising:
- a heating element;
a dose of activating liquid adjacent to said element and separate therefrom;
a frangible container containing said liquid; and
a substantially liquid-impervious covering layer means to enclose said element and said container, said layer means defining at least one tortuous air passage therethrough, whereby said layer means serves both to promote sustained production of heat and to prevent liquid from exiting the pad.
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Accused Products
Abstract
A self-contained warming pad characterized by a heating element, an adjacent dose of activating liquid within a frangible container, and a substantially liquid-impervious cover enclosing the element and frangible container and having at least one tortuous air passage therethrough. Features include a cover having thermal insulating qualities, and a frangible container made of a meltable substance having a melting point chosen to control the upper temperatures of the pad. Other features relate to a cover configuration which provides an annular breathing passage, and a porous resilient mass within the pad which provides a substantial breathing capacity. The heating element is preferably an electrochemical element, and most preferably a complex electrochemical element having two cathode layers and one anode layer in a sandwich-like structure.
68 Citations
41 Claims
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1. A self-contained warming pad comprising:
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a heating element; a dose of activating liquid adjacent to said element and separate therefrom; a frangible container containing said liquid; and a substantially liquid-impervious covering layer means to enclose said element and said container, said layer means defining at least one tortuous air passage therethrough, whereby said layer means serves both to promote sustained production of heat and to prevent liquid from exiting the pad. - 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, 26, 27, 28, 29, 30)
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31. A self-contained warming pad comprising:
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a heating element; a dose of activating liquid adjacent to said element and separate therefrom; a frangible container containing said liquid; and a substantially liquid-impervious cover enclosing said element and said container and defining at least one tortuous air passage therethrough, said passage comprising a peripheral air passage formed near the edge of said cover. - View Dependent Claims (32)
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33. A self-contained warming pad comprising:
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a heating element; a dose of activating liquid adjacent to said element and separate therefrom; a frangible container containing said liquid; a substantially liquid-impervious cover enclosing said element and said container and defining at least one tortuous air passage therethrough; and a porous resilient mass adjacent to said heating element whereby to provide a breathing capacity inside said cover. - View Dependent Claims (34, 40, 41)
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35. A self-contained warming pad comprising:
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a heating element; a dose of activating liquid adjacent to said element and separate therefrom; a frangible container containing said liquid, said container being made of a meltable substance having a melting point such that its heat of fusion can control pad upper temperatures when activated; and a substantially liquid-impervious cover enclosing said element and said container and defining at least one tortuous air passage therethrough, said passage comprising a peripheral air passage formed near the edge of said cover. - View Dependent Claims (36)
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37. A self-contained warming pad comprising:
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a heating element; a dose of activating liquid adjacent to said element and separate therefrom; a frangible container containing said liquid, said container being made of a meltable substance having a melting point such that its heat of fusion can control pad upper temperatures when activated; a substantially liquid-impervious cover enclosing said element and said container and defining at least one tortuous air passage therethrough; and a porous resilient mass adjacent to said heating element whereby to provide a breathing capacity inside said cover. - View Dependent Claims (38, 39)
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Specification