Refrigeration – Cooled enclosure – Portable receptacle
Patent
1980-02-29
1981-12-08
King, Lloyd L.
Refrigeration
Cooled enclosure
Portable receptacle
62530, F25D 308
Patent
active
043041060
ABSTRACT:
A tray particularly advantageous for patient feeding in hospitals and like applications including a body having means defining therein a sealed chamber containing a chemical compound or mixture which is one of a group including magnesium nitrate; acetamide; benzoic acid; strontium bromide; napthalene; a mixture of urea and benzoic acid wherein the ratio of benzoic acid to urea is substantially 2 to 1 by weight; a mixture of benzoic acid and benzomide in proportion wherein they are substantially equal by weight; and aluminum potassium sulfate, said one chemical compound or mixture in said chamber embodying chemically combined water in an amount insufficient to provide a total crystallization thereof in the solid state, said one compound or mixture as sealed in said body being repeatedly reversible from a solid to a liquid state and back to a solid state and being distinguished by a transition or phase change temperature which is substantially above 32.degree. F. and below 212.degree. F., and said one chemical compound or mixture being further characterized in that, in cooling the liquid form thereof through its transition or phase change temperature, there is a substantially instantaneous conversion of the liquid to a crystalline and powder form immediately below said transition temperature producing a heat of formation the level of which does not materially fall over a period of time approaching one hour or more, thereby to maintain, in the process, a relatively stable temperature of said body for an extended period of time.
REFERENCES:
patent: 2526165 (1950-10-01), Smith
patent: 2803115 (1957-08-01), Shepherd
patent: 2810276 (1957-10-01), Murray
patent: 3091091 (1963-05-01), Ferrante
patent: 3130288 (1964-04-01), Monaco et al.
patent: 3269144 (1966-08-01), Poris
patent: 3383880 (1968-05-01), Peters
Bloom Jerome P.
King Lloyd L.
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