Apparatus for treating fiber suspension
CA 2060074 C · Owner: A. Ahlstrom Corporation · Inventors: Hanana, Karim; Ljokkoi, Risto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for treating fiber suspension is especially applicable for pulp screening in the wood processing industry particularly, for the separation of light particles from fiber suspensions. The apparatus comprises an outer casing with conduits for inlet pulp accepts, heavier, rejects and lighter rejects; a filter cylinder and a rotor the surface of whichis provided with at least one protrusion; and an opening for guiding the light rejects through the surface of the rotor.
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 27, 1992 and granted April 15, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2014.
- 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.