Composition based on zirconium oxide and cerium oxide, preparation method therefor and use thereof
CA 2224409 C · Owner: Blanchard, Gilbert · Inventors: Aubert, Maryline; Birchem, Thierry; Touret, Olivier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A zirconium oxidebased composition containing cerium oxide and having a specific surface area of at least 30 m?2¿/g after calcining for six hours at 900 ·C. The composition is a pure solid solution of cerium oxide in zirconium oxide. In an alternative embodiment the composition may further include a doping element and have a specific surface area of at least 25 m?2¿/g after calcining for six hours at 1000 ·C. A method for preparing such compositions is also disclosed wherein a mixture containing a zirconium compound and a cerium IV compound is prepared in a liquid medium; the mixture is heated to over 100 ·C; after heating the resulting reaction medium is adjusted to a basic pH; the …
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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 June 28, 1996 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 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.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.