Gate controlling apparatus for a thyristor valve
CA 1063672 A · Owner: Hitachi, Ltd. · Inventors: Amano, Hisao; Ogata, Fumio; Watanabe, Atsumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A gate controlling apparatus for a thyristor valve including a plurality of series connected thyristors controlled by a narrow gate pulse. The apparatus includes a circuit for judging whether the thyristor valve is to be in the conductive state or not, a circuit for detecting a forward voltage across at least one of the thyristors in the thyristor valve and an, AND circuit for generating an output at a time when an AND condition between the respective outputs of the judging circuit and the forward voltage detector circuit is satisfied. The apparatus further includes a circuit for detecting a period of inverse voltage across at least one of the thyristors in the …
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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 October 2, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 2, 1996.
- 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.