Antimuscarinic bronchodilators
CA 2116356 C · Owner: Stobie, Alan · Inventors: Cross, Peter E.; Stobie, Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (1) wherein X is either (a) a phenyl group optionally substituted by 1 or 2 substiuents each independently selected from halo, CF3, C1-C4 alkyl C1-C4 alkoxy and hydroxy or (b) a thienyl group; and Y is of formula (Ya) or (Yb)where A and B are 0,1 or 2,D and E are 0 or 1,F is 0-3 and D + E + F = 1-3,Z is 0,1 or 2 R1 and R2 are H or, alkyl or form a ring and R3 is C1-C4 alkyl, C3-C6 cycloalkyl or optionally substituted phenyl or benzyl are antimuscarinic, bronchodilators useful for treating chronic obstructive airways disease or asthma.
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 September 3, 1992 and granted March 31, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 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.