Process for the preparation of (3-fluoropyridin-2-yloxy)phenoxypropionic acids
CA 2053803 C · Owner: Novartis Ag · Inventors: Haessig, Robert; Siegrist, Urs
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-Fluoropyridin-2-yloxy)phenoxypropionic acids of formula I (See formula I), wherein X is hydrogen fluoro, chloro, bromo or trifluoromethvl and Y is hydrogen, sodium or potassium, axe prepared by reacting a compound of formula 11 wherein X and Y are as defined for formula I in an anhydrous medium, with , hydrogen fluoride and a diazotising agent, and converting the diazonium fluoride so produced by, thermal decomposition into the (3-fluoropyridin-2-yloxy)phenoxypropionic acid of, formula I.
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 October 21, 1991 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 21, 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.