Process for preparing sertraline intermediates
CA 2109818 C · Owner: Pfizer Limited · Inventors: Williams, Michael Trevelyan; Welch, Willard Mckowan Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides the substantially geometrically and optically pure trans-steroisomeric form of a compound of formula (1), wherein R1 is H or C1-C4 alkyl together with processes for its , preparation. The compounds are intermediates for the preparation of the antidepressant agent known as sertraline.
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 July 3, 1992 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 2014.
- 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.