Expired Canadian patentCanada
Benzopyran and related ltb4 antagonists
CA 2126752 C · Owner: Koch, Kevin · Inventors: Koch, Kevin
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Benzopyran and other benzo-fused leukotriene B4 antagonists have formula (I) wherein R1 is a phenyl or substituted, phenyl group and A, n, R2 and R3 are as defined herein.
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 November 13, 1992 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 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.
FiledNovember 13, 1992
GrantedMay 16, 2000
Term endedNovember 13, 2012
Patent numberCA 2126752 C
Classification (IPC)C07D311/22 +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.