Benzopyrans and related ltb4 antagonists
CA 2117349 C · Owner: Pfizer Inc. · Inventors: Ruggeri, Sally Gut; Koch, Kevin; Reiter, Lawrence Alan
Overview
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 A n, R1, R2 and R3 are as, defined herein. The compounds of formula (I) wherein R1 is c-substituted CR4R5-COOR13 may be prepared from the corresponding c-substituted CF3SO3 compound by reaction with a trimethylsilyl ketene acetal.
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 October 13, 1992 and granted February 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 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.
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.