Apparatus for thickening fibre suspension
CA 2033920 A1 · Owner: Tampella Papertech Oy · Inventors: Holopainen, Pentti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thickener for thickening fibre suspension comprising a rotating screen surface (3) to the inner surface of which the suspension to be thickened is fed and through which part of the water contained in the suspension is removed. The screen surface (3) of the thickener is conical and arranged to rotate around a horizontal shaft (1). The fibre suspension is fed close to the end of the conical screen surface (3; 103) with smaller diameter, so that it is displaced along the screen surface (3) towards the end having a larger diameter while water is removed from it through the screen surface (3). The fibre suspension is removed from the screen surface (3) over the edge having the larger diameter …
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 January 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 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.