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US 4,045,640 AGranted
Stay-hot control for microwave oven
AssigneeNorris Industries, Inc.
InventorsRaymond R. McQueen, Jr., Christian E. Buerki
Life of this patent
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AssigneeNorris Industries, Inc.
InventorsRaymond R. McQueen, Jr., Christian E. Buerki
Estimating the term…
The infra-red browning element of a microwave oven is automatically energized at the end of either the microwave or browning timing cycle, to provide heat to the oven for keeping the food hot (at a lower temperature than that used for browning). This end result is achieved by ganging the timing switch which controls the supply of power to the microwave and browning circuits with a switch which controls the supply of power to the stay-hot circuit. Thus, when the microwave or browning segment of the timing switch opens at the end of the timing cycle, the stay-hot segment of the timing switch is closed to supply power to the stay-hot circuit. A thermostat switch is provided in the stay-hot circuit so that the heat output of the infra-red element is regulated to a suitable temperature for stay-hot operation. Stay-hot operation is selectively set by means of a selector control to provide automatic stay-hot operation at the end of the timing cycle.
In a microwave oven including microwave cooking circuit means, a power source, a timer and switch means for connecting the power source to the cooking circuit means for a predetermined time period in response to said timer, and an infra-red heating element, the improvement whereby means are provided for automatically keeping the oven hot when said predetermined time period has elapsed comprising:
In a microwave oven, said oven including a microwave cooking unit and an infra-red browning unit and switch means for alternatively providing power from a power source to either one or the other of said units, the improvement being a stay-hot control for said oven comprising:
Dependencies are inferred from the claim text.