Method for separating zinc
CA 2233518 A1 · Owner: Wagner, Richard H. O. · Inventors: Silva, Christopher J.; Van Trang, Cuong; Ferron, Cesar J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a method of separating zinc from a zinc. bearing material, comprising the steps of exposing the material to a caustic leach solution, to liberate the zinc thereto, thereby to form a zinc-bearing solution; reacting the zinc-bearing solution with a sulphide-bearing precipitant to form a zinc sulphide solid phase; and separating the solid phase from the solution.
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 March 30, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 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.