Piperazine derivatives
CA 2123548 C · Owner: Daiichi Pharmaceutical Co. Ltd. · Inventors: Kubota, Hideki; Hasegawa, Atsushi; Ando, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound represented by formula (I): (see formula I), wherein Q represents an aryl group a heterocyclic group, a, diarylmethyl group an aralkyl group composed of an aryl, group and an alkylene group an alkyl group or a cycloalkyl, group, in which the aryl group heterocyclic group, and the, aryl moiety of the diarylmethyl group and aralkyl group may be substituted with one or more substituents; R represents a bicyclic, substituted, nitrogen-containing heterocyclic group or a substituted phenyl group, in which the nitrogencontaining heterocyclic group is composed of a 5-membered substituted, aromatic or saturated ring containing one or two nitrogen atoms and a 6-membered ring; and Z …
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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 May 13, 1994 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 13, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 13, 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.