Method for producing high-grade nickel matte and metallized sulfide matte
CA 2098521 C · Owner: Outokumpu Harjavalta Metals Oy · Inventors: Makinen, Tuula Sisko
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 method for producing a high-grade nickel matte and a highly oxidized slag in a flash smelting furnace, and for reducing the slag from the flash smelting furnace and for sulfidizing the resulting matte in an electric furnace. The matte produced in the flash smelting furnace and in the electric furnace are both directly conducted to further hydrometallurgical treatment.
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 June 16, 1993 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 2015.
- 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.