Process for reactivation of water-soluble hydroformylation catalysts
CA 2080746 C · Owner: Konkol, Werner · Inventors: Kohlpaintner, Christian; Bahrmann, Helmut; Herrmann, Wolfgang A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
To regenerate the activity of deactivated water-soluble, hydroformylation catalysts which comprise rhodium and sulfonated or carboxylated arylphosphines maleic acid, fumaric acid or olefinically unsaturated compounds of the formula, (see fig. I), in which X is O S, N-R5 or P-R5 and R3, R4 and R5 are, identical or different and are hydrogen an alkyl radical, or an aryl radical, are added.
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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 16, 1992 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2014.
- 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.