Isolation of taxanes
CA 2428654 A1 · Owner: Saiji, Lahu · Inventors: Saiji, Lahu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method for the isolation of taxanes of high priority from the crude extract of naturally occurring Taxus canadensis which comprises the steps of: a) filtering the crude extract by liquid column chromatography; b) enriching the taxanes obtained from step a) by precipitation and crystallization; c) separating the taxanes obtained from step a) by liquid column chromatography; and d) dissolving the separate taxanes in a polar organic solvent mixture comprising an alcohol and a non-alcohol solvent which , solution is then subjected to further separation by liquid column chromatography, and isolating substantially pure paclitaxel from cephalomannine; and all solvent mixtures …
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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 13, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 13, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2023.
- 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.