Method for heap biooxidation of ore
CA 2203258 C · Owner: Geobiotics, Inc. · Inventors: Kohr, William J.; Shrader, Vandy; Shield, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for improving the heap biooxidation rate of refractory sulfide ore particles that are at least partially biooxidized using a recycled bioleachate off solution is provided. The method includes the steps of biooxidizing a heap (10) of refractory sulfide ore particles with a bioleachate solution; collecting, from the heap, a bioleachate off solution that includes a plurality of inhibitory materials dissolved therein the concentration of each , individual inhibitory material being below its individual inhibitory concentration but the combined concentration of at least two of the inhibitory materials being sufficient to inhibit the biooxidation rate of the refratory sulfide ore …
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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 October 25, 1995 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2017.
- 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.