Method for froth flotation
CA 2462740 C · Owner: Sgs Lakefield Research Ltd. · Inventors: Coupland, Dale R.; Kosick, Glenn A.; Dobby, Glenn S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of froth flotation where a pressurized stream of feed slurry and a pressurized stream of air are delivered to a contactor vessel. The feed slurry includes a mixture of particles of oil or hydrophobic materials and water. The feed slurry and the stream of pressurized air are maintained within certain flow and pressure parameters and allowed to intermix within the contactor vessel to permit the attachment of air bubbles to the particles of oil or hydrophobic materials thereby forming particle-bubble aggregates. The contents of the contactor vessel are discharged into a separation vessel where said particle-bubble aggregates form a froth for removal as a concentrate.
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 March 31, 2004 and granted March 24, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 31, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 31, 2026.
- 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.