Expired Canadian patentCanada
Process for producing metal hydroxides with a small specific area
CA 2089760 C · Owner: Krivanec, Heinz · Inventors: Wurmbauer, Dieter; Krivanec, Heinz
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a process for producing metal hydroxides with a small specific area in which the metal hydroxide is produced by hydrating a corresponding metal oxide and then treating it under pressure in an autoclave.
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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 July 29, 1991 and granted April 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 29, 1991
GrantedApril 14, 1998
Term endedJuly 29, 2011
Patent numberCA 2089760 C
Classification (IPC)C01B13/14 +2 more
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.