Separation process for platinum group elements
CA 2507370 C · Owner: Ishiwata, Shoji · Inventors: Sato, Kazusuke; Uno, Takahiro; Ishiwata, Shoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
One object of the present invention is to provide a separation process that enables , the efficient separation of selenium tellurium, and platinum group elements from a , material containing selenium/tellurium and platinum group elements. In order to achieve , this object, the invention provides a separation process for platinum group elements , comprising: a step (A) for treating a material containing selenium/tellurium and platinum , group elements with alkali a step (B) for leaching selenium/tellurium and a , step (C) for , separating the platinum group element-containing leaching residue and the selenium/tellurium leachate.
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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 August 28, 2003 and granted April 24, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2025.
- 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
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.