Tricyclic compounds
CA 2395834 A1 · Owner: Kuroki, Yoshiaki · Inventors: Kuroki, Yoshiaki; Kawaguchi, Tetsuo; Ikuta, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel tricyclic compounds of general formula (I) or pharmacologically acceptable salts thereof, exhibiting leukotriene antagonism wherein R1 is , halogeno or the like; R2 is nitro or the like; A is a group derived from a five- or six-membered aromatic heterocycle containing 1 to 3 heteroatoms selected from the group consisting of nitrogen oxygen and sulfur, or the , like; B is -OCH2- or the like; X is sulfur or the like; Y is C1-10 alkylene which may be substituted with halogeno or the like; Z is optionally protected carboxyl or the like; ---- represents a single or double bond; m is an integer of 1 to 4; and n is an integer of 1 to 3.
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 December 28, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 28, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2022.
- 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.