Phosphonooxy and carbonate derivatives of taxol
CA 2088931 C · Owner: Wong, Henry · Inventors: Doyle, Terrence W.; Farina, Vittorio; Wong, Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A taxol derivative of formula I, (see fig I) or a pharmaceutically acceptable salt thereof in which, R j is -COR2 in which R2 is t-butyloxy C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl C3-6 cycloalkyl, or, phenyl, optionally substituted with one to three same or different C1-6 alkyl, C1-6 alkoxy, halogen or -CF3 groups;, R y is C1-6 alkyl C2-6 alkenyl, C2-6 alkynyl, C3-6, cycloalkyl or a radical of the formula -W-R x, in which W is a bond C2-6 alkenediyl, or, -(CH2)t -, in which t is one to six; and R x is naphthyl, furyl, thienyl or phenyl, and furthermore R x can be optionally substituted with one to three same or different C1-6 alkyl, C1-6 alkoxy, halogen or -CF3 groups; R w is hydrogen, …
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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 February 5, 1993 and granted April 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 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.
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.