Treatment of aqueous compositions containing contaminants
CA 2439436 A1 · Owner: Sutherland, George · Inventors: Sutherland, George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed methods and compositions for the preparation and use of aqueous dispersions of water insoluble polymers for waste water treatment and purification. An aqueous composition of the water insoluble polymer and the contaminant is prepared and the polymer undergoes phase inversion to flocculate, the contaminant, which may be separated. The polymer can be recovered.
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 September 3, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 3, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2025.
- 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.