Central screen
CA 2567046 C · Owner: Metso Paper, Inc. · Inventors: Hernesniemi, Lasse; Nykaenen, Tuomo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods for continuously producing pulp from lignocellulose-containing material in a digester are disclosed in which the porous lignocellulosecontaining material is fed from the top to the bottom of the digester liquor , is pumped through the porous column of lignocellulose-containing material in a predetermined direction, and liquor is simultaneously withdrawn through at least one central screen assembly and through a wall screen assembly. A digester for continuously producing pulp from lignocellulose-containing material is also disclosed.
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 May 24, 2005 and granted July 2, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.