Process for loading fibers with calcium carbonate
CA 2352885 A1 · Owner: Voith Paper Patent Gmbh · Inventors: Heise, Oliver; Dr. Rheims, Jorg; Dolle, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
During the chemical process of loading with calcium carbonate fibers contained in a pulp, suspension, a medium containing calcium oxide or calcium hydroxide is added to the pulp, suspension. This treated pulp suspension is charged in at least one reactor with pure carbon, dioxide (or a medium containing carbon dioxide) which, during the progression , of the reaction converts at least a significant portion of the starting materials (calcium oxide and/or calcium, hydroxide anal carbon dioxide) into the reaction products, calcium carbonate and water. This, reaction is accomplished by properly controlling the pulp suspension's pH.
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 July 11, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 11, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2023.
- 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.