Treatment of mineral tailings
CA 2090141 C · Owner: Davies, Peter · Inventors: Davies, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of treating mineral tailings such as those derived from mining operations includes the steps of separating the slimes forming alternate layers of slimes and a coarse material between peripheral berms and intermediate berms the berms being of a coarse, material, and allowing water to pass therethrough and away from the berms. The water moves through the berms by virtue of the pressure exerted on the lower layers by the mass of the layers above. The coarse material may be the coarse fraction of the mineral tailings.
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 February 23, 1993 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2015.
- 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.