Process for stereoselective synthesis of prostacyclin derivatives
CA 2847985 C · Owner: United Therapeutics Corporation · Inventors: Penmasta, Raju; Guo, Liang; Moriarty, Robert M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method is described for making 9-deoxy-PGF1-type compounds particularly prostacyclin , derivatives and novel intermediate compounds useful in the process. In contrast to the prior art, the , method is stereoselective and requires fewer steps than the known methods for making these , compounds. A compound of the of the formula: (see above formula), is disclosed.
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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 October 26, 1998 and granted February 3, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2020.
- 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.