US 4,983,798 · Granted 1991-01-08

Warming devices and method using a material with a solid-solid phase change

Warming devices are described having solid organic particulates that are solid at room temperature and which exhibit a meso-crystalline transition temperature within a range of about 30 DEG to about 200 DEG C. The particles can be heated by a variety of methods such as microwave radiation or hot liquids. Contemplated objects include vacuum bottles, coffee mugs, stadium pads, foot warming boxes, mittens, caps, snowsuits, and other wearing apparel. The solid particles act as a reusable heat reservoir to release heat over an extended period of time or absorb ambient heat and serve a protective function.

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