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Mold assembly for microwave oven

  • US 5,281,784 A
  • Filed: 01/04/1993
  • Issued: 01/25/1994
  • Est. Priority Date: 01/04/1993
  • Status: Expired due to Fees
First Claim
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1. A mold assembly for use by children to produce in a microwave oven, having a settable timer, shaped plastic play pieces, said assembly comprising;

  • (a) a mold insertable in the microwave oven formed of a material non-reactive to microwave energy, said mold having at least one cavity therein receiving a plastic molding composition for forming a shaped play piece, said composition having a predetermined curing temperature; and

    (b) a heating element associated with the mold formed by an inert matrix having ferrite particles dispersed therein which absorb microwave energy and which have a Curie point somewhat above said curing temperature of said composition received in the cavity, whereby the element acts to thermally heat the mold to raise the temperature of the composition to its curing temperature to produce said plastic play piece, said heating element absorbing microwave energy and heating up until the Curie point is reached, at which point no microwave energy is absorbed even though the microwave oven continues to operate for a pre-set time.

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