Resolution of amines
CA 2295800 A1 · Owner: Laboratorios Del Dr. Esteve, S.A. · Inventors: Torrens-Jover, Antoni; Frigola-Constansa, Jordi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process comprises reacting the mixture consisting of 2-phenyl(1-methyl-1Hpyrazol-5-yl)methoxy-N,N-dimethyl-etanamine (I) with an enanthiomer of an optically active acid in order to form a diasteroisomer salt separating said , salt and releasing the enantiomer from said compound (I). The dextrorotatory enantiomer of (I) can be obtained by reacting a racemic or non racemic mixture of (I) with (')-ditoluyl-L-tartaric acid optionally mixed with p-, toluensulfonic acid. The compound (I) has analgesic properties and its most active enantiomer is the destorotatory enantiomer.
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 6, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2020.
- 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.