Method for regulating an electrolytic cell
CA 2439321 C · Owner: Vanvoren, Claude · Inventors: Bonnardel, Olivier; Vanvoren, Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for regulating an electrolytic cell for the production of aluminium by the reduction of alumina dissolved in a melted cryolite bath. According to the invention solidified bath talus (15) is formed on the internal walls of the tank (2) and a quantity B called the talus evolution indicator is determined which is sensitive to the evolution of said solidified bath talus. Subsequently at least one of the tank regulation means (such as the anode-metal distance (H)) and/or at least one control operation (such as the addition of AlF¿3?) is modified according to the value obtained for said indicator. The indicator can be determined from electric measurements on the …
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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 February 26, 2002 and granted July 5, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.