Bisheterocyclic compound
CA 2086606 A1 · Owner: Yamanouchi Pharmaceutical Co. Ltd. · Inventors: Noshiro, Osamu; Koike, Reiko; Niigata, Kunihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
I), (a) , (b) , (c), (d) , (e) A novel bisheterocyclic compound represented by general formula (I), which is useful as a hypoglycemic drug, and a novel hypoglycemic drug containing the same wherein R1 and R2 are the same or different from each other and each represents (a), (b), (c), (d) or (e); R3 represents hydrogen, acetylamino or lower alkyl which may be substituted with carboxyl or sulfoxy; X and Y are the same or different from each other and each represents oxygen, sulfur or NH; B1 and B2 represent a benzene or naphthalene ring which may be substituted with lower alkyl; L1 and L2 are the same or different from each other and each represents a single bond, oxygen, sulfur sulfinyl, or, …
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 1, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 1, 2013.
- 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.