Heap leach process using elemental sulphur to generate heat
CA 2517693 C · Owner: Hunger, Colin John · Inventors: Hunger, Colin John; Williams, Tamsin Lisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved heap leach process for the bacterial heap leaching of base metal sulphide ores, the process characterised by the addition of elemental sulphur to the ore, whereby sulphur oxidising bacteria indigenous to or added to, the , ore may oxidise the elemental sulphur and generate heat within the ore heap.
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 24, 2004 and granted August 14, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 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.