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Systems and methods for determining doneness of microwave-heated bodies

  • US 4,786,773 A
  • Filed: 12/18/1986
  • Issued: 11/22/1988
  • Est. Priority Date: 12/18/1986
  • Status: Expired due to Fees
First Claim
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1. A system for indicating doneness of a body of material heated by microwave energy, comprising a thin electrically conductive metal element having first and second opposed extended surfaces;

  • indicator means disposed on the first surface of the element for producing a visually observable change of appearance upon being heated to a predetermined elevated temperature or upon being maintained at such temperature for a predetermined time; and

    means for supporting the element in substantially fixed relation to and externally of the body, when the body is disposed in a microwave oven for heating by microwave energy, such that the element is also disposed in the oven with the indicator means positioned to be externally visible, and such that the element receives heat from the body by conduction and/or radiation as the body is heated by microwave energy;

    the dimensions of the element and the disposition of the indicator means thereon being such as substantially to shield the indicator means from temperature-elevating irradiation by microwave energy.

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