Multi-roll cluster rolling apparatus
CA 2018261 C · Owner: Yarita, Ikuo · Inventors: Yarita, Ikuo; Kenmochi, Kazuhito; Watanabe, Yuichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-roll cluster rolling apparatus has a pair of work rolls, and a plurality of first intermediate rolls a, plurality of second intermediate rolls and a plurality of backup rolls arranged successively in the mentioned order behind each the work roll. A roll crown presented by unidirectinally tapering one end of a roll is imparted to at least a pair of rolls. e.g. the work rolls selected, from a roll group consisting of the work rolls first, intermediate rolls and the second intermediate rolls. A roll crown approximated by at least one-pitch portion of a waveform is imparted to at least one other pair of rolls e.g. pairs of the first intermediate rolls. A roll crown approximated by at …
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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 5, 1990 and granted November 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2012.
- 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.