Method in winding of a paper web
CA 2219489 C · Owner: Valmet Corporation · Inventors: Makela, Jarmo; Jorkama, Marko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for winding a paper web in which the paper web is wound by a winder or equivalent winding apparatus onto a roll and the running speed of the winder is controlled based on the frequency of rotation of the roll so that when the frequency of rotation of the roll approaches a range of oscillation, i.e. a range of frequency of rotation of the roll in which intensive oscillation occurs the running speed is lowered quickly so that the frequency of rotation of the roll is reduced to a level lower than the lower frequency of the range of oscillation. Thereafter the running speed of the, winder is increased so that the frequency of rotation of the roll remains substantially constant until …
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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 October 28, 1997 and granted January 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2019.
- 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.