Control device for thyristor converter
CA 2098026 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Itoh, Katsuro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for controlling a thyristor converter including series connected thyristors. The device includes a plurality of forward voltage detection circuits each of, which detects forward voltage of one of the thyristors and generates a forward voltage signal based on the detected forward voltage, respectively. The device includes a first circuit for generating a conduction command signal which commands the thyristor converter to conduct and a second, circuit for generating a plurality of light gate signals and a gate monitoring signal based on a plurality of modified forward voltage signals and the conduction command signal. Each of the light gate signals is applied to one of the thyristors …
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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 June 9, 1993 and granted October 28, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2015.
- 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.