Conversion of non-ferrous matte
CA 2108216 C · Owner: Hall, David Eric · Inventors: Marcuson, Samuel Walton; Hall, David Eric; Landolt, Carlos Alfredo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A non-ferrous matte conversion process is disclosed in which molten non-ferrous matte, essentially nickel and/or copper sulfide and iron sulfide isprovided in a suitable vessel, such as a modified Pierce-Smith converter. The bath is stirred from below with a non-reactive sparging gas such as nitrogen, and surface-blown, from above with an oxygen-containing gas. A flux is added to the melt to raise a fluid slag. In addition, cold crushed matte is added to the bath. The cold matte acts to maintain the temperature of the bath so as to prevent overheatingwhich can damage the converter lining. The matte addition also serves as a source for additional converter feed. As the reaction progresses …
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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 12, 1993 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 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.