Hydrometallurigical process for recovery of zinc
CA 2245036 A1 · Owner: Mortimer Technology Holdings Limited · Inventors: Lakshmanan, Vaikuntam Iyer; Laughlin, Robert Gardiner Willis; Convey, John Raymond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the recovery of zinc from a zinc ore. The process comprises leaching material obtained from a zinc ore with dilute sulphuric acid in which, essentially all of the zinc is in the form of zinc oxide. The leachate obtained is separated for recovery of zinc. Preferably the material is substantially free of zinc ferrite. In preferred embodiments, the material is obtained from an iron-bearing zinc ore especially zinc, sulphide ore or concentrate that has been subjected to a, roasting step at a temperature of greater than 1050°C.
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 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2020.
- 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.