Title: Temperature discrimination apparatus

Abstract: A temperature discrimination apparatus is disclosed which comprises a first switching device exhibiting regenerative switching action at a power level which is dependent on the temperature sensed by such first switching device, a second switching device exhibiting regenerative switching action solely in response to a pre-selected power level, means connected to the first and second switching devices for determining if the first switching device has switched before the second switching device in the cycle of the a.c. power source as the magnitude of the voltage increases from zero. This will serve as an indication that the temperature to be sensed has been reached.

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Inventors: Meijer, Robert S. (Montreal, CA, US)

Application Number: 530390
Filing Date: 1974-12-06
Publication_date: 1976-02-10
Assignee: Multi-State Devices Ltd. (Dorval, CA)
Primary Class(es): 327/458 219/501, 327/476, 327/512
Other Classes:
US Patent Ref:

3475677	Oct, 1969	Swinehart et al.	307/310.
3648074	Mar, 1972	Nurnberg	307/310.
3700933	Oct, 1972	Harkenrider et al.	307/310.

Other Refs:
Primary Examiner: Zazworsky, John
Assistant Examiner:
Attorney: Spencer & Kaye