Insulated type switchgear device
CA 2231304 C · Owner: Hitachi, Ltd. · Inventors: Morita, Ayumu; Ohshita, Youichi; Horikoshi, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an insulated type switchgear device in which a pair of arc electrodes (4) and (5) are separably disposed in an opposing manner in a vacuum tube (30) and a movable conductor (3) extending from a back face of a movable arc electrode (5) to an outside from the vacuum tube (30) and the pair of arc electrodes (4) and (5) are designed to be separate through a rotation of the movable conductor (3) around a predetermined main axis (15), the movable arc electrode (5) is structured in such a manner that an electrode center of the movable arc electrode (5) when the movable arc electrode (5) is brought into its circuit breaking position (Y2), is to be located near a center axis of the stationary arc …
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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 March 5, 1998 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2020.
- 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.