Treatment of gold bearing ore
CA 2121932 A1 · Owner: Field, Brian T. · Inventors: Lindquist, William E.; Field, Brian T.; Mccormick, Bernard P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for roasting gold containing ore in which a flash furnace means is provided in, particular a gas suspension furnace for roasting the ore. Hot gas and the gold containing ore to be roasted are supplied to the furnace means, wherein the hot gas roasts the ore within the furnace means at temperatures between about 500°c and 700°c while the ore is suspended in the hot gas, after which the roasted ore is discharged from the furnace means along with the hot gas. In the apparatus of the present the ore to be calcined may optionally be preheated, prior to the ore entering the furnace means by, suspending the fresh ore in hot gas.
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
- Filed April 22, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2016.
- 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.