Aqueous dispersions based on water-soluble polymers.
CA 2224952 A1 · Owner: Vanhoye, Didier · Inventors: Vanhoye, Didier; Tembou Nzudie, Denis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous dispersions can be prepared with a base of high-concentration low-viscosity water-soluble polymers by the polymerization of at least one water-soluble monomer in the presence of a polymeric dispersion agent. These aqueous dispersions can be used as flocculants for water treatment.
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 January 23, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2020.
- 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.