Susan Marie Watson

US Patent:

45334838, Aug 6, 1985

Filed:

Jul 2, 1973

Appl. No.:

5/375332

Inventors:

Susan S. Watson - San Diego CA
William K. R. Watson - San Diego CA

Assignee:

American Hospital Supply Corporation - Evanston IL

International Classification:

C09K 318

US Classification:

252 70

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.

US Patent:

39511278, Apr 20, 1976

Filed:

Sep 25, 1974

Appl. No.:

5/509261

Inventors:

Susan Steves Watson - San Diego CA
William Keith Ross Watson - San Diego CA

Assignee:

Kay Laboratories, Inc. - San Diego CA

International Classification:

A61F 706
F24J 100

US Classification:

126206

Abstract:

A flexible container having a substantially planar configuration encloses a first chemical having characteristics for being supercooled to maintain a liquid state even at temperatures below its melting point. A second chemical can be mixed with the first chemical in the container to initiate the crystallization of the first chemical at the substantially constant temperature of the melting point of the first chemical. The container can be enclosed in an insulation envelope to moderate the temperature of the device. The first chemical may include sodium thiosulfate pentahydrate which provides a desirable constant temperature of 48. degree. C. The second chemical may include sodium borate pentahydrate or sodium sulfite which provides the first chemical with a desirable sandy configuration during crystallization in the. alpha. pentahydrate form. The sodium borate pentahydrate or sodium sulfite goes into solution or chemically complexes with the sodium thiosulfate in a manner such that subsequent supercooling can be achieved.