Method for separating pentenenitrile isomers
CA 2423564 A1 · Owner: Kunsmann-Keitel, Dagmar Pascale · Inventors: Kunsmann-Keitel, Dagmar Pascale; Jungkamp, Tim; Baumann, Robert
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 separating pentenenitrile isomers having a relative volatility alpha in the region 1.0 - 1.3 in a pressure range of 1 - 500 kPa by means of separation. According to said method, the distillation is carried out in the presence of a liquid diluent which forms azeotropes with the pentenenitrile isomers in the same pressure conditions whose relative, volatility alpha is higher than the pentenenitrile isomers which are to be separated.
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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 September 25, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2023.
- 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.