Piperazine derivatives as 5-ht receptors antagonists
CA 2125182 A1 · Owner: John Wyeth & Brother Limited · Inventors: Cliffe, Ian A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I) where A is an alkylene chain of 2 to 5 carbon atoms optionally substituted by one or more lower alkyl groups, R represents hydrogen or one or two same or different lower alkyl groups, R1 is a monocyclic aryl or heteroaryl radical R2 is a mono or bicycle aryl radical and R3 is cycloalkyl and the pharmaceutically acceptable acid addition salts are novel. They are 5-HT1A-antagonists which may be used for example, in, treating anxiety.
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 24, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 24, 2014.
- 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.