Expired Canadian patentCanada
Semi-synthesis of taxane derivatives using metal alkoxides and oxazinones
CA 2092962 C · Owner: Holton, Robert A. · Inventors: Holton, Robert A.
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Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing taxane derivatives taxol by providing a metal alkoxide having the bi tri-, or, tetracyclic taxane nucleus, reacting the metal alkoxide with an oxazinone to form an intermediate and converting, the intermediate to the taxane derivative.
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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 March 30, 1993 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 30, 1993
GrantedJanuary 19, 1999
Term endedMarch 30, 2013
Patent numberCA 2092962 C
Classification (IPC)C07D305/14 +1 more
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.