Carbonaceous block with high thermal shock resistance
CA 2192707 C · Owner: Aluminium Pechiney · Inventors: Samanos, Bernard; Dreyer, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Procedure for making carbon blocks with high heat resistance and specifically anodes for the production of aluminum via fused-salt electrolysis from a carbon aggregate which after grinding and particle-sizing, is mixed with a pitch-based binder to form a paste which is densified and formed by compacting before being baked at a temperature over 900 degrees Celsius. The procedure is characterized by: regulation of the particle size of the carbon aggregate by grinding and sorting into three fractions: ultra-fine with a diameter less than 30 µm; sand with diameter between 30 and 300 .mum.; granule with diameter over 300 µm; and adjustment of the mass ratio of the granule (Gr) and sand (S) …
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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 December 11, 1996 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 11, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 11, 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
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.