Compounds and processes for preparing optically pure multicyclic oxy-containing ring compounds having at least two chiral centers
CA 2097190 A1 · Owner: Powers, Matthew R. · Inventors: Studt, William L.; Airey, John E.; Powers, Matthew R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to stereospecific processes for the preparation, separation and purification of multicyclic oxy-containing ring system compounds such as dibenzofuran and benzoxocine-type compounds which exhibit 5HT3-antagonist properties including unique CNS, anti-emetic and gastric prokinetic activity and which are void of any significant D2 receptor binding affinity.
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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 12, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 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
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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.