Process for the preparation of cis-beta-phenylglycidic-(2r,3r)acid
CA 2071979 C · Owner: Rhone-Poulenc Rorer S.A. · Inventors: Duchesne, Jean-Pierre; Mulhauser, Michel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method for the preparation of beta -phenylglycidic-(2R,3R) acid optionally in the form of salt or ester by precipitation of the salt of the beta -phenylglycidic-(2R,3R) acid with (+)- alpha -methylbenzylamine-(R) in a solution of a mixture of salts of cis and trans beta -phenylglycidic acids with (+)- alpha -methylbenzylamine-(R). Utilisation of the resulting product for implementing the method for the preparation of taxol and its analogues.
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 February 20, 1991 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2013.
- 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.