Heterocyclic compounds, their production and use
CA 2128055 A1 · Owner: Takeda Chemical Industries, Ltd. · Inventors: Imamoto, Tetsuji; Natsugari, Hideaki; Ichimori, Yuzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel compounds represented by the formula: wherein the ring A and the ring B each stand for an optionally substituted benzene ring;, Ar stands for an optionally substituted aryl group or an optionally substituted heterocyclic group; Q stands for an oxygen atom or a sulfur atom; R stands for a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted hydroxyl group or an optionally substituted amino group; X stands for -O- or -NR1- wherein R1 stands for a hydrogen atom or an optionally substituted hydrocarbon group;, Y stands for -O-, -NR2- wherein R2 stands for a hydrogen atom or an optionally substituted hydrocarbon group, or a bond;, m denotes 1, 2 or 3 and, n …
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 14, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 14, 2016.
- 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.