Expired Canadian patentCanada
Resolution of .alpha.-(phenoxy)phenylacetic acid derivatives
CA 2529774 C · Owner: Diatex, Inc. · Inventors: Daugs, Edward D.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method for producing an enantiomerically enriched alpha-(phenoxy)phenylacetic acid compound of the formula (I): from its enantiomeric mixture, where R1 is alkyl or haloalkyl and X is halide.
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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 18, 2004 and granted May 27, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2026.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 18, 2004
GrantedMay 27, 2014
Term endedJune 18, 2024
Patent numberCA 2529774 C
Classification (IPC)C07C231/18 +1 more
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.