Hydroxymethyl-indolizidines and quinolizidines
CA 2038984 C · Owner: Merrell Dow Pharmaceuticals (Canada) Inc. · Inventors: Rhinehart, Barry L.; Kang, Mohinder S.; Liu, Paul S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention describes a group of polyhydroxylated indolizidines and quinolizidines and their esters. These compounds have the general formula: They are prepared starting from 2,6-dideoxy-2,6-imino-1,3,4,5tetrakis-O-(phenylmethyl)-D-glycero-L-gulo-heptitol or a corresponding N-substituted compound. The compounds are useful in the treatment of diabetes and as a-glucosidase I inhibitors.
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 March 25, 1991 and granted December 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 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.