Crust breaker device for aluminium electrolysis cells
CA 2025499 A1 · Owner: Sagbraten, Alf · Inventors: Sagbraten, Alf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A crust breaker device being used to break crusts of aluminium electrolysis cells, comprises a driven unit with a bar for instance a piston-/sylinder device with a piston rod (7). The rod is provided for axial movement essentially in the, vertical direction and to the lower part of the rod is, connected a cutter bar or crow bar (5) which is designed to be moved through the crust and make a hole therein. The cutter bar (5) is connected to, but electrically isolated from the rod (7) by means of a cast connection (1,3,4,6).
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 September 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 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.