Arrangement for gas collection in aluminium reduction cells
CA 2015364 C · Owner: Elkem Aluminium Ans · Inventors: Olsen, Arnt 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 an arrangement for gas collection in electrolytic, aluminium reduction furnaces equipped with S~derberg anode. The arrangement comprises a plurality of liftable cover plates 8 - 11 which cover the complete area, between the sidewalls of the furnace and the anode casing 2. The cover plates 8 - 11, are gas tight sealed against the circumference of the anode casing 2 and against the, furnace sidewalls 7. The cover plates 8 - 11 are on their upper side equipped with a, plurality of ribs 12. A channel 13 comprising of a lower plate 14 an , incleaned plate 15, and an upper plate 16 is inserted in recesses in the ribs 12.
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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 April 25, 1990 and granted December 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2012.
- 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.