Gas isolated disconnecting switch and gas isolated switching device
CA 2068142 C · Owner: Ishikawa, Toshio · Inventors: Ishikawa, Toshio; Kurosawa, Yukio; Ozawa, Jun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gas isolated disconnecting switch provides a sufficient restriking surge suppressing function with no adverse effect on the operation of a circuit breaker in the system enabling, the circuit breaker to reliably interrupt a fault current. In the closed condition of the switch, a main stationary member engages a main movable member, and an auxiliary movable member 17 engages an auxiliary stationary member. A portion of an auxiliary conductor which passes through a cylindrical magnetic body is short-circuited by the main stationary member and the main movable member and there is no influence on the operation of the circuit breaker. During an opening operation of the switch, the auxiliary …
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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 May 7, 1992 and granted June 9, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2014.
- 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.