Antispasmodic agents
CA 2017535 C · Owner: Bass, Robert J. · Inventors: Cross, Peter E.; Alker, David; Bass, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides compounds of the formula:- (see above formula), wherein k is 1, 2 or 3; m is 1, 2 or 3;, n is 1, 2 or 3;, P is 0 1 or 2;, X is O; S or a direct link, with the proviso that when X is O or S; n is 2 or 3;, R1 is H or C1-C4 alkyl; and R2 is an optionally substituted phenyl or heteroaryl group;, and pharmaceutically acceptable salts thereof. These compounds are useful for the treatment of motility disorders, particularly those of the gut such as irritable bowel syndrome.
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 May 25, 1990 and granted February 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 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.