Process for making copper metal powder, copper oxides and copper foil
CA 2204858 C · Owner: Jenkins, Jackson G. · Inventors: Jenkins, Jackson G.; Haines, Ronald K.; Peckham, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for making copper metal powder from copper-bearing material (10) comprising: (A) contacting copper-bearing material (10) with a leaching solution (70) to dissolve copper ions and form a copper-rich leaching solution (74); (B) contacting said copper-rich leaching solution (74) with an extractant (84) to form a copper-rich extractant (90) and a copper-depleted leaching solution (124); (C) separating; (D) contacting said copper-rich extractant (90) with stripping solution (106) to form a copper-rich stripping solution (142) and a copper-depleted extractant (114); (E) separating to form a first electrolyte (150); (F) applying voltage across anodes (26) and cathodes (28) to …
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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 17, 1996 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2018.
- 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.