Induction heating apparatus
CA 2006384 C · Owner: Tsurusaki, Kazuya · Inventors: Izumi, Kiyoshi; Tsurusaki, Kazuya; Katayama, Keiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The device for heating apparatus for heating steel plate comprising a leading phase angle setting circuit which is supplied with a detection voltage signal from an output side of a high frequency inverter connected to a load circuit to supply a leading phase angle signal to gates of thyristors constituting the high frequency inverter. A phase control circuit is provided in the way of a voltage detection circuit which is supplied with the detection voltage signal from the output side of the high frequency inverter to control a phase of the detection voltage signal periodically. A series inductor is provided in the form of a power supply bus line connected to an induction heating coil a …
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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
- Filed December 21, 1989 and granted July 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2011.
- 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.