Low temperature thermal upgrading of lateritic ores
CA 2084252 A1 · Owner: Macvicar, Douglas James · Inventors: Doyle, Christopher Denis; Shi, Dingzhu; Macvicar, Douglas James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a thermal upgrading process whereby nickelcontaining limonite or limonite/saprolite blends are pelletized with requisite amounts of solid carbon reductant and a sulfur-bearing concentrating agent. The pellets are fed to a reactor where they are gradually heated causing reduction of the metal values. The reduced pellets are then held in a "metallics growth zone" of the reactor at a temperature high enough to allow for liquid-phase migration of the metallics within the pellets but below the point at which the pellets become sticky. The metallics growth zone is provided with a carefully controlled combustion gas atmosphere equivalent to about 60-65% aeration of partial …
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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 1, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 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.
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.