Power relay control circuit for a microwave oven
CA 1263451 C · Owner: Yoo, Wook Yeol · Inventors: Yoo, Wook Yeol
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A power relay control circuit for a microwave oven including a microprocessor as its controller is provided wherein two power, relay driving transistors are to be turned on or turned off by a thyristor, which is triggered by a switching transitors and a, stabilizing circuit respectively. Two signals of different levels from terminals of the microprocessor are supplied to the base of the switching transistor and the stabilizing circuit in order to make the oven start heating operation. If the microprocessor operates in all possible abnormal states, both signals from the terminals of the microprocessor are to become the same level all HIGHs or all LOWs, making either of the power relay …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.