Refining element
CA 2453668 A1 · Owner: Virving, Nils · Inventors: Virving, Nils
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pair of co-acting refining elements (10 11) intended for a refiner for , processing ligno-cellulosic fibrous material in a refining gap between two opposed refining discs rotating relative to one another. The refining elements (10, 11) are intended to be placed directly in front of each other on opposed refining discs. The refining elements (10 11) are provided with a plurality , of processing means in the form of pins (12 13) extending upward from the , bottom surface of the refining elements and the pins on one refining element , are arranged to extend into intermediate spaces between the pins on the other refining element. The bottom surface of each refining element (10 11) between …
Read the whole patent
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 July 31, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2024.
- 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.