Process for the recovery of rhodium from distillation residues of products of the oxo synthesis
CA 2104509 A1 · Owner: Diekhaus, Gerhard · Inventors: Diekhaus, Gerhard; Kappesser, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Frankfurt, 27.08.1992, PAT/rcht-sei Hoe92/Y014 Abstract of the disclosure, For the recovery of the rhodium contained in them as soluble compounds, the distillation residues of products of the oxo synthesis are treated with oxygen or an oxygen-containing gas in the presence of an alkali metal salt of a C2- to C5-monocarboxylic acid. The noble metal is then extracted from the organic phase with the aqueous solution of a complexing reagent, if appropriate after it has already been extracted beforehand with water by itself.
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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 20, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2015.
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Timeline
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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.