Paper production process featuring alternating cationic and anionic polymer additions
CA 2607332 C · Owner: Dolff, Elisabeth · Inventors: Dolff, Elisabeth; Olausson, Jan; Legnerfaelt, Bjoern
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present application relates to a process for the production of a paper product, which process comprises: providing a furnish comprising fillers and fibers; , subjecting said furnish to polymer treatment in which an excess of polymers , is added to the furnish by alternating cationic and anionic polymer additions in at least three steps; , dewatering the furnish on a wire to form a fiber web; pressing said fiber web; drying the fiber , web to form said paper product said furnish containing fillers in such an amount that the , paper product obtained by the process contains at least 15% by weight of fillers.
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 11, 2006 and granted February 16, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2026.
- 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.