Composition with base of cerium oxide or cerium and zirconium oxides, in extruded form, method of preparation and use as catalyst
CA 2274013 C · Owner: Rhodia Chimie · Inventors: Blanchard, Gilbert; Quemere, Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a composition with base of cerium oxide or cerium and zirconium oxide in extruded form, its method of preparation and its use as catalyst. The method of preparation of this composition is characterised in that it consists in extruding a hydroxide or an oxygen hydroxide of cerium or hydroxides or oxygen hydroxides of cerium and zirconium. The composition can be used as catalyst or catalyst support particularly in the treatment of exhaust gases of internal combustion engines in the process of dehydrogenation of ethyl benzene into styrene in methanation catalysis, in the treatment of a solution or suspension of organic compounds by wet oxidation.
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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 3, 1997 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2019.
- 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.