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US 4,067,313 AGranted
Exothermic composition and hot pack
AssigneeReadi Temp, Inc.
InventorWilliam R. Donnelly
Life of this patent
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AssigneeReadi Temp, Inc.
InventorWilliam R. Donnelly
Estimating the term…
A particulate composition producing an exothermic reaction when mixed with water, and a hot pack containing such a composition, and water isolated therefrom until the intended time for use. The composition consists essentially of, in parts by weight, about 40 to about 90 parts anhydrous calcium chloride, about 12 to about 25 parts anhydrous sodium acetate, and about 5 to 15 parts calcium oxide. A hot pack, per the invention, comprises a sealed, impermeable, flexible outer enclosure containing the composition, and a sealed, impermeable, flexible, easily ruptured inner enclosure containing about 40 to about 90 parts by weight of water. The proportions of the elements of the particulate composition will vary somewhat in accordance with the objectives of the hot pack in which the composition is applied. When the contents of the hot pack are activated, it will gradually reach, maintain and be limited to be predetermined safe temperature. For example, in an embodiment particularly advantageous for use as a food warmer, this predetermined temperature will be about 107.degree. C and will be maintained for a period of time up to 20 minutes. An embodiment applied as a food and hand warmer will, by contrast, gradually reach and maintain a temperature of about 84.degree. C for a period up to 20 minutes and more. In any case the hot pack, when its contents are activated, will be placed in a condition that it is moldable to conform to the surface or surfaces to which it is applied. The pack of the subject invention also features, in preferred embodiment, an improved construction for the inner enclosure designed to give highly controlled conditions and insurance as to the time the inner enclosure will rupture.
A composition producing an exothermic reaction over an extended period of time when mixed with water, consisting essentially of, in parts by weight, about 40 to about 90 parts anhydrous calcium chloride, about 12 to about 25 parts anhydrous sodium acetate, and about 5 to about 15 parts calcium oxide, said composition forming a moldable gel upon mixing with about 40 to about 90 parts by weight of water at ambient temperature and maintaining a temperature not in excess of about 107.degree. C for a period of time up to about 20 minutes.
A hot pack adapted to conform to the contours of surfaces to which it is applied, comprising a sealed, flexible, impermeable, water insoluble outer enclosure having high resistance against puncture, rupture and abrasion;
A heat transfer pack adapted to conform to the contours of surfaces to which it is applied, comprising a sealed, flexible, impermeable, water insoluble outer enclosure having high resistance against puncture, rupture and abrasion;
Dependencies are inferred from the claim text.