Method for the recycling of a lewis acid
CA 2491240 A1 · Owner: Haderlein, Gerd · Inventors: Haderlein, Gerd; Jungkamp, Tim; Luyken, Hermann
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for the recycling of a Lewis acid from a reaction mixture (I), obtained from the hydrocyanation of an olefinicallyunsaturated compound to give a nitrile which has a miscibility gap with water under certain concentration, pressure and temperature conditions in the , presence of a catalyst system comprising a Lewis acid and a complex compound of a phosphorus-containing compound suitable as a ligand and a central atom suitable for said compound, characterised in that a) said complex compound is separated from a mixture (I) to give a mixture (II) b) mixture (II) is , treated with water and undergoes a transformation generating pressure and temperature …
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 July 4, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 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
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.