Intense yet energy-efficient process for electrowinning of zinc in mobile particle beds
CA 2229661 C · Owner: Siu, Stanley C. · Inventors: Siu, Stanley C.; Evans, James W.; Newman, Oliver Michael Griffiths
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Zinc metal is deposited on mobile seed particles in an electrowinning process. Exceptionally favorable results in terms of production rate current , efficiency and energy consumption are achieved by using a unique combination of design parameters and operating conditions achieved by selected ranges for particle size, current density, particle bed thickness and acid content of , the electrolyte.
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 28, 1996 and granted October 24, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 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.