Expired Canadian patentCanada
Resolution of threo-methylphenidate
CA 2243542 C · Owner: Medeva Europe Limited · Inventors: Zavareh, Hooshang Shahriari
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing substantially single enantiomer d-threomethylphenidate, proceeds by means of a classical salt resolution using (-)menthoxyacetic acid.
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 March 7, 1997 and granted February 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 7, 1997
GrantedFebruary 18, 2003
Term endedMarch 7, 2017
Patent numberCA 2243542 C
Classification (IPC)C07D211/34
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.