Condensed heterocyclic compounds, their production and use
CA 2032695 A1 · Owner: Takeda Chemical Industries, Ltd. · Inventors: Hitaka, Takenori; Akimoto, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The compounds of the formula z-?- CONHCHCOOR1, CH2CH2COOR2, wherein the ring A is a pyrrole ring which may be hydrogenated; - B - is a divalent cyclic or chain group which may be substituted; one of Q1 and Q2 is N with the, other being N or CH; W is a halogen or hydrogen atom or a group bonded to the bonding line with a carbon nitrogen, oxygen or sulfur atom, provided that W is not -NH2; X is an amino, hydroxyl or mercapto group; Y is a hydrogen atom or a hydroxyl or amino group; Z is a straight-chain divalent group having a number of atoms of 2 to 5 composed of carbon atoms which each may be substituted, or carbon atoms which each may be substituted and one hetero atom which may be …
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 19, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2012.
- 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.