Aluminium electrolysis cell with continuous anode
CA 2008225 C · Owner: Gjýrven, Sigmund · Inventors: Naterstad, Tormod; Holmen, Hans Kr.; Gjýrven, Sigmund
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aluminium electrolysis cell comprising a cathode (13) and an above the cathode disposed continuous anode (14) being composed of carbon bodies which are glued or in some other way connected to one another, Onto the anode is added new carbon bodies to replace carbon material being consumed during the electrolysis process. The anode is divided into sections in the form of easily detachable holders or cassettes (8) which are disposed close to one another in a row longitudinally of the cell. The cassettes (8) are each at their upper ends provided with projections (23) being designed to be disconnectable to bearer walls or constructions at the long sides of the cell.
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 January 22, 1990 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 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.