Process for production of aluminium hydroxide from ore containing alumina
CA 2099279 C · Owner: Harato, Takuo · Inventors: Ishibashi, Kazuhisa; Kumagae, Yoshio; Ishida, Takahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for the production of aluminum hydroxide involving extraction of alumina from an alumina-containing ore by an aqueous alkaline solution, supplying a slurry containing the alumina-containing ore with a high solid content which, has been prepared from a small amount of an alkaline solution together with an aqueous alkaline solution which is preheated to a temperature that is high enough to have a temperature after the mixing with the slurry that is higher than the extraction temperature of alumina. Simultaneously or after the mixing feedings the mixture to an extraction apparatus comprising a tube reactor, extracting alumina from the alumina-containing ore under conditions of a …
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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 October 29, 1992 and granted March 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2014.
- 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.