Damper mechanism
CA 2089756 C · Owner: Sugatsune Industrial Co. Ltd. · Inventors: Ohshima, Kazuyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A damper mechanism comprises a cylinder a movable shaft and a, movable valve, the movable valve is disposed along the movable shaft and swingable on the outer peripheral surface of the movable shaft the movable, shaft is inserted into the cylinder with the movable valve and rotatable relative to said cylinder, the front end of the movable valve is disposed vis-a-vis the inner peripheral surface of the cylinder and capable of detachably contacting the cylinder to form a nonreturn valve realized by utilizing the movable valve and disposed between the inner peripheral surface of the cylinder and the outer peripheral surface of the movable shaft a, partitioning member is disposed between 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
- Filed November 30, 1991 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2013.
- 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.