Uranium extraction
CA 1093831 A · Owner: Anglo American Corporation Of South Africa Limited · Inventors: Hanf, Norbert W.; Davidson, Raymond J.; Schmidt, Christian G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for extracting uranium values from a pyrite concentrate containing at least 20% by weight sulphur and at least 50 grams per ton of uranium calculated at, U308, including the steps of roasting the concentrate at a temperature in the range 650 to 750°C to convert the uranium to uranium sulphate, and solubilising the uranium sulphate in the roasted concentrate by means of a sulphuric acid leach of pH not exceeding 3.
Read the whole patent
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
- Granted January 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 20, 1998.
- 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.