Process for making copper wire
CA 2176487 C · Owner: Wright, Roger N. · Inventors: Kohut, Stephen J.; Eamon, Michael A.; Peckham, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for making copper wire directly from a copper-bearing material, comprising: (A) contacting said copper-bearing material with an effective amount of at least one aqueous leaching solution to dissolve, copper ions into said leaching solution and form a copper-rich aqueous leaching, solution; (B) contacting said copper-rich aqueous leaching solution with an effective, amount of at least one water-insoluble extractant to transfer copper ions from said, copper-rich aqueous leaching solution to said extractant to form a copper-rich extractant and a copper-depleted aqueous leaching solution; (C) separating said, copper-rich extractant from said …
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 August 7, 1995 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 2017.
- 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.