Zirconium dioxide powder, method for the production thereof, the use thereof and sintered bodies prepared therefrom
CA 2029707 A1 · Owner: Huls Aktiengesellschaft · Inventors: Scharf, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing zirconium dioxide powder which, process comprises dissolving zirconyl chloride in concentrated formic acid, removing water, hydrogen chloride and formic acid by evaporation, calcining the reaction product at elevated temperature and, when required, grinding the calcined product. The product so prepared can further comprise stabilizers such as, oxides of yttrium, cerium, magnesium and the rare earths. The zirconium oxide powder according to the invention is suitable for the production of sintered bodies which can be exposed to high mechanical and/or thermal stresses or can be used for optical purposes.
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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 November 9, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2012.
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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.