Electric heating – Microwave heating – With control system
Reexamination Certificate
2005-03-15
2005-03-15
Walberg, Teresa J. (Department: 3742)
Electric heating
Microwave heating
With control system
C219S720000
Reexamination Certificate
active
06867402
ABSTRACT:
A microwave cooking appliance includes an oven cavity, a magnetron and a load sensing system. The load sensing system is used to detects the presence of a load in the oven cavity by introducing a high frequency energy burst into the oven cavity, with the energy burst being reflected back. A controller, based on a time period between emitted and reflected signals, determines whether a load is present in the oven cavity. If no load is present, operation of the magnetron is terminated. Preferably, the high frequency energy burst is an ultrasonic acoustic frequency energy burst in a range between approximately 10 kHz and 100 kHz.
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Diederiks & Whitelaw PLC
Maytag Corporation
Walberg Teresa J.
LandOfFree
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