Self-contained warming pad

Details Self-contained warming pad Self-contained warming pad

1976-11-19

1978-06-20

Favors, Edward G.

Stoves and furnaces

Heaters

Chemical

44 3A, 132 362B, F24J 104

Patent

active

040955834

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.

REFERENCES:
patent: 2541736 (1951-02-01), Alexander
patent: 3207149 (1965-09-01), Spindler
patent: 3774589 (1973-11-01), Kober
patent: 3924603 (1975-12-01), Chapin
patent: 3980070 (1976-09-01), Krupa

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