Method of recovering sulfur from leaching residue under atmospheric pressure
CA 2454854 C · Owner: Jx Nippon Mining & Metals Corporation · Inventors: Saito, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of economically, industrially and effectively recovering sulfur from a leaching residue produced by leaching sulphide minerals (e. g. copper concentrates) under atmospheric pressure includes the steps of pretreating the leaching residue with an acid solution and selectively recovering sulfur from the leaching residue by a flotation process.
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 December 30, 2003 and granted August 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2025.
- 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.