Antimuscarinic bronchodilators
CA 2073005 C · Owner: Stobie, Alan · Inventors: Stobie, Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-Quinuclidinyl butanoate and propanoate antimuscarinic bronchodilators. purticularly useful in the treatment of chronic obstructive airways disease and asthma of formula (I), and their pharmaceutically acceptable salts wherein X is either (a) a, phenyl group optionally substituted by one or two substituents each independently selected from halo CF3. C1-C4 alkyl,/C1-4, alkoxy and hydroxy or (b) a thienyl group: and "Het" is either (a) a 5-membered nitrogen-containing heterocylic group attached to the adjacent carbon atom either by a carbon or a ring nitrogen atom and which is selected from imidazolyl pyrazolyl, triazolyl and tetrazolyl, (b) an oxadiazolyl or thiadiazolyl group attached to …
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, 1991 and granted November 10, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2013.
- 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.