Improved lining for aluminum production furnace
CA 2219890 C · Owner: Saint-Gobain Ceramics & Plastics, Inc. · Inventors: Cortellini, Edmund A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of producing aluminum, comprising the steps of: a) providing an aluminum reduction cell comprising a cathode (4) an anode (6) and a sidewall , (2), the sidewall (2) having a thickness and comprising: i) a lining (7) consisting essentially of a material selected from the group consisting of silicon nitride, silicon carbide, titanium diboride and boron carbide and , having a density of at least 95 % of theoretical density at least closed , porosity, and no apparent porosity and ii) an insulating layer backing the lining, b) contacting the lining with an electrolyte comprising at least 60 % cryolyte and having a temperature of between 650 ~C and 1100 ~C and c) , providing an …
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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 May 23, 1996 and granted August 14, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2018.
- 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
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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.