Piperazine derivatives
CA 2015034 C · Owner: John Wyeth And 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
Piperazine derivatives of formula, and their pharmaceutically acceptable acid addition salts are disclosed. Tn the, formula n is 1 or 2 R is hydrogen or lower, alkyl, R1 is an aryl or nitrogen containing heteroaryl radical, R2 is hydrogen or lower alkyl, R3 is aryl, C4-8 alkyl or, aryl(lower)alkyl and X is a functionalised group of specified meaning. The compounds exhibit activity as 5-HT1A antagonists and can be used, into alia, for the treatment of CNS disorders, such as 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 April 20, 1990 and granted August 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 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.