Cerium-zirconium oxidy based composition, preparation method and use thereof
CA 2111892 C · Owner: Chopin, Thierry · Inventors: Touret, Olivier; Chopin, Thierry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns new cerium-zirconium mixed oxide-based compositions (solid solutions) presenting very high specific surface areas namely at least greater than 80 m2/g and preferably at least 100 m2/g or even 150 m2/g the said surfaces moreover being thermally stable. The amounts of zirconium in solid solution in the cerium oxide may be very large for example between 1 and 60 atom %. They are obtained according to a process consisting in heating an aqueous solution containing in the required stoichiometric proportions a soluble cerium compound such as ceric nitrate and a soluble zirconium compound such as zirconyl nitrate in recovering, specifically by filtration the reaction product …
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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 20, 1993 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2015.
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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.