Expired Canadian patentCanada
Process for the preparation of cyclopropyl carboxylic acid esters and derivatives
CA 2641976 C · Owner: Clark, Adrian · Inventors: Clark, Adrian; Larsson, Ulf; Jones, Elfyn
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the novel intermediate compound: trans-(1R,2R)-2-(3,4-difluorophenyl)cyclopropanecarbonyl chloride.
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 May 31, 2001 and granted March 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 31, 2001
GrantedMarch 20, 2012
Term endedMay 31, 2021
Patent numberCA 2641976 C
Classification (IPC)C07C247/22 +2 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.