Anticholinergic agents
CA 2072575 C · Owner: Pfizer Limited · Inventors: Alker, David; Cross, Peter Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Selective muscarinic receptor antagonists of formula (I) wherein R1 and R2 , are both optionally substituted phenyl the, broken line is an optional bond, X is (a) (b) or CH- when the double bond is , absent or is (c) when the double bond is present X being attached to a carbon atom of A A is selected from certain piperidine and pyrrolidine groups, n is 1 to 3 and R3 is optionally substituted phenyl or thienyl pyridyl or pyrazinyl.
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 18, 1990 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 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.