Improved method for beneficiating titanium bearing material containing iron
CA 2028487 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Zander, Bo Harry; Ericson, Aake Sandor; Reeves, James William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for beneficiating particulate, titanium bearing material containing iron oxides comprising:, (a) subjecting said particulate material to reducing conditions in the presence of a particulate carbonaceous material, (b) feeding the products resulting from step (a) to a mechanical reduction kiln and contacting the products with solid hydrated ferrous chloride under reducing conditions which cause additional iron oxide to be converted to metallic iron and the solid hydrated ferrous chloride to vaporize, (c) removing the products resulting from step (b) from the kiln, (d) contacting the gaseous product from step (c) with water under conditions which form solid hydrated ferrous chloride, …
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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 24, 1990 and granted October 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2012.
- 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.