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Food warning device containing a rechargeable phase change material
| Details |
Inventors: Frohlich, Sigurd; Koellner, Hans Jochen; Salyer, Ival;
Assignee: Phase Change Laboratories, Inc. (San Diego, CA)
Primary Examiner: Walberg; Teresa
Assistant Examiner: Patel; Vihod D
Attorney, Agent or Firm: Killworth, Gottman, Hagan & Schaeff, LLP
A heating device for food and other products is provided. The device includes a unit containing a rechargeable phase change material which is capable of being charged with heat energy by a heat source such as a conduction, convection, radiant heat, electrical resistance, electrical inductance, microwave, or radio frequency. The phase change material may be provided in a variety of forms and may comprise linear alkyl crystalline alkyl hydrocarbons, alkyl hydrocarbon waxes, crystalline fatty acids, linear crystalline primary alcohols, ethylene copolymers, polyethylene, polyethylene glycol, polyethylene oxide, and acetamide. |
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DETAILED DESCRIPTION The present invention provides a solution to the needs currently existing in the art by providing a food heating device employing a rechargeable phase change material which emits heat for longer periods of time than currently used devices and which can be easily recharged.
The phase change material may be provided in a variety of forms and may be heated using a variety of heat sources including conduction, convection, radiant, electrical resistance, electrical inductance, and microwave.
According to one aspect of the invention, a heating device for food and the like is provided comprising a container and a rechargeable phase change material unit removably positioned in the container.
The rechargeable phase change material unit includes a first shell portion and a second shell portion forming a cavity with at least one layer of a phase change component including a phase change material disposed in the cavity.
The phase change material is selected from the group consisting of linear crystalline alkyl hydrocarbons, alkyl hydrocarbon waxes, crystalline fatty acids, linear crystalline primary alcohols, ethylene copolymers, polyethylene, polyethylene glycol, polyethylene oxide and acetamide.
The phase change material is capable of being charged with heat energy by a heat source selected from the group consisting of conduction, convection, radiant, electrical resistance, electrical inductance, microwave, or combinations thereof to maintain the device at a desired temperature.
Where the heat source comprises microwave heat (such as from a microwave oven), the phase change material preferably includes a microwave absorbing additive selected from the group consisting of water, glycerol, glycerol esters, polyethylene glycol and carbon black.
In a preferred embodiment of the invention, the phase change material comprises a linear crystalline alkyl hydrocarbon having a melting point of from about 25.
degree.
C.
to 100.
degree.
C.
The phase change component may be provided in several forms
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