Use of water soluble polymers as dispersion agent of aqueous calcium carbonate suspension, resulting aqueous suspensions and their uses
CA 2394791 C · Owner: Suau, Jean-Marc · Inventors: Jacquemet, Christian; Mongoin, Jacques; Suau, Jean-Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns the use of water soluble homopolymers and/or copolymers of acrylic acid with one or several acrylic vinyl or allyl monomers as dispersion agents of aqueous suspension of mineral particles derived from a mechanical and/or thermal upgrading step following a wet-process grinding step not using dispersant and with low dry-matter concentration. The invention also concerns said aqueous suspensions and their uses in paper making paint, fillers for rubber and synthetic resins detergent and cleaning formulations, ceramics drilling fluids, cements, plasters and other uses in civil engineering the building sector and public works.
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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 December 20, 2000 and granted June 21, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2022.
- 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.