H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/1
H05B 6/68 (2006.01) E02D 3/11 (2006.01) H05B 6/80 (2006.01)
Patent
CA 1212425
ABSTRACT A system is provided for controlling microwave heaters in order to efficiently heat frozen ground. The heaters are energized and deenergized by a control unit in response to the temperature sensed a selected distance from a heater. The control unit also deenergizes the heater in response to a temperature sensed in the vicinity of the applicators of the heater in order to protect the heaters from overheating.
432797
Lahti Howard R.
Lahti Wallace R.
Canadian Patents And Development Limited - Societe Canadienne De
Macrae & Co.
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