Hydromorphinone and hydrocodeinone compositions and methods for their synthesis
CA 2674424 C · Owner: Gault, Robert · Inventors: Sandison, Mark D.; Harclerode, William H.; Gault, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the preparation of a ketone from a narcotic alkaloid of formula (I): , (see formula I), wherein R is hydrogen or an alcohol protecting moiety and thus having an , allyl , alcohol moiety is disclosed. The method includes mixing the narcotic alkaloid with an , acid in the presence of a catalyst wherein the method is carried out in the substantial , absence of hydrogen gas. The method is useful for preparing hydromorphone and hydrocodone compositions having novel impurity profiles. Compositions comprising , hydromorphone and hydrocodone are also 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 November 9, 2000 and granted October 2, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 9, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2022.
- 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.