Operation of aluminium electrowinning cells having metal-based anodes
CA 2451574 A1 · Owner: Nguyen, Thinh T. · Inventors: De Nora, Vittorio; Nguyen, Thinh T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of inhibiting fluorination and passivation of a metal-based anode having an alloy outer portion made of iron with nickel and/or cobalt and covered with an integral oxide surface layer facing a cathode in an aluminium fluoride-comprising molten electrolyte. This method comprises maintaining an amount of at least one basic fluoride such as , calcium or lithium fluoride, in the electrolyte to reduce the acidic activity of aluminium fluoride thereby inhibiting fluorination corrosion of iron and , passivation of nickel and/or cobalt of the alloy outer portion.
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 May 28, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2024.
- 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.