Electric heating – Metal heating – Of cylinders
Patent
1993-01-04
1994-01-25
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055R, 264 26, 4251748R, H02B 680
Patent
active
052817849
ABSTRACT:
A mold assembly for use by children to produce in a microwave oven plastic play pieces. The assembly includes a mold, non-reactive to microwave energy and is provided with shaped cavities for receiving a flowable, plastic molding composition non-reactive to microwave energy and having a predetermined curing temperature. Underlying the cavities is a thermal heating element formed by microwave energy-absorbing ferrite particles dispersed in an inert matrix. The particles have a Curie point higher than the curing temperature of the molding composition so that the heating element heats the composition in the mold cavities to effect curing and hardening thereof, thereby forming the play pieces. The mold assembly is enclosed within a safety container non-reactive to microwave energy. The container is provided with a removable cover and a temperature-responsible latching mechanism which releases the cover to permit withdrawal of the mold assembly only when its temperature is reduced to a level at which it is safe to handle.
REFERENCES:
patent: 3420923 (1969-01-01), Ashworth et al.
patent: 3429359 (1969-02-01), Hollingsworth
patent: 4822966 (1989-04-01), Matsubara
patent: 4882463 (1989-11-01), Kyougoku et al.
patent: 4933526 (1990-06-01), Fisher et al.
patent: 4965424 (1990-10-01), Bagley
patent: 5057659 (1991-10-01), Schneider et al.
Ebert Michael
Leung Philip H.
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