Heat source providing a substantially constant temperature

Details Heat source providing a substantially constant temperature Heat source providing a substantially constant temperature

1973-07-02

1985-08-06

Barr, Josephine L.

Compositions

Frost-preventing, ice-thawing, thermostatic, thermophoric,...

126263, C09K 318

Patent

active

045334838

ABSTRACT:
A heat source includes a cartridge which contains a first chemical having properties for maintaining a liquid state below its particular melting point. A second chemical, which can be introduced through a valve into the cartridge, triggers the crystallization of the first chemical; this crystallization occurs at the substantially constant temperatures of the particular melting point. The first chemical can be recycled by heating the cartridge above its melting point and subsequently cooling the first chemical below its melting point while maintaining its liquid state. A particularly desirable melting point for the first chemical is provided by a eutectic compound which may include sodium thiosulfate pentahydrate and sodium acetate trihydrate. The heat source is particularly adapted to be disposed in a transportable apparatus for heating a baby even during transport.

REFERENCES:
patent: 780352 (1905-01-01), Kafka
patent: 811750 (1906-02-01), Spieske
patent: 1887618 (1932-11-01), Bell
patent: 1894775 (1933-01-01), Levenson
patent: 2114396 (1938-04-01), McFarlin et al.
patent: 2677664 (1954-05-01), Telkes
patent: 3952519 (1976-04-01), Watson

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