Method for inhibiting the formation of acid mine drainage
CA 2183390 C · Owner: Gould, W. Douglas · Inventors: Bechard, Genevieve; Lortie, Lyne; Gould, W. Douglas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is described for inhibiting the production of acid mine drainage from the disposal of sulphide tailings and waste rock deposition during mining and milling of sulphide containing ores which comprises adding to said sulphide tailings or waste rock deposition an effective amount of 2- mercapto-1-methyl imidazole or a 1,3,4-thiadiazole selected from the group consisting of 2,5-dimercapto-1,3,4-thiadiazole and 5-amino-2-thiol-1,3,4-thiadiazole to inhibit oxidation of sulphides and thereby prevent the formation of acid mine drainage.
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 August 15, 1996 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 15, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 2018.
- 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.