Method for the preparation of fine grain ores
CA 2378956 A1 · Owner: Tessmer, Gero · Inventors: Tessmer, Gero; Milionis, Konstantin; Schenk, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for the preparation of fine-grain ore (2) in which the ore (2) is subjected to wind screening using a gas. Two fractions are formed (6, 8): a crude fraction (6) and a primary fine fraction (8) whereby the crude fraction (6) is ejected (6) and the primary fine fraction (8) is carried along by the gas, then deposited out of the gas and at least the majority thereof this is processed together with the crude fraction (6). The primary fine fraction is subjected again to a wind screening (8) using a gas which results in the deposition of a secondary fine fraction (18) and is processed together with the crude fraction (6). An ultrafine fraction (19) is …
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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 June 16, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2022.
- 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.