Method for the production of woodpulp
CA 2445340 A1 · Owner: Voith Paper Patent Gmbh · Inventors: Heinzmann, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for the production of woodpulp for further use in the preparation of a fibre web, in particular a paper or cardboard web whereby the woodpulp obtained from a woodpulp production process is firstly treated with adjuncts in a chemical precipitation reaction and the treated woodpulp subsequently dried and prepared for further use or brought into a form for dispatch.
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 February 15, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 15, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 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.