Process for the preparation of phenylacetic derivatives of thienopyridines and of the intermediate .alpha.-bromo-phenylacetic acids
CA 2019301 C · Owner: Sanofi · Inventors: Bouisset, Michel; Joel, Radisson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula, in which R1 and R2 are hydrogen or halogen axe, prepared by reacting an aldehyde of formula: with CHHr3 and KOH in a mixture of an inert solvent and water. Further an ester of compound (I) wherein R1 is H and R2 is 2-Cl is reacted with 4,5,6,7-tetrahydrothieno3,2-cpyridine to produce a compound of formula III :, which is useful as a medicament.
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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 June 19, 1990 and granted September 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2012.
- 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.