Method for the isolation and purification of taxane derivatives
CA 2094910 A1 · Owner: Rao, Koppaka V. · Inventors: Rao, Koppaka V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method for isolating certain clinically important taxane derivatives from the crude extract of a naturally occurring Taxus species comprising treating the extract by reverse phase liquid chromatography on an adsorbent; causing the taxane derivatives to be adsorbed on the adsorbent; and recovering the taxane derivatives from the adsorbent by elution with an eluant. The taxane derivatives thus isolated in pure form are taxol taxol-7-xyloside, 10-deacetyltaxol, 10-deacetyltaxol-7-xyloside cephalomannine, cephalomannine-7-xyloside 10-deactylcephalomannine-7-xyloside, baccatin III 10-deacetylbaccatin III, baccatin VI, and brevitaxane A.
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 November 4, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 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.