3'-substituted nucleoside derivative
CA 2182707 C · Owner: Matsuda, Akira · Inventors: Sasaki, Takuma; Matsuda, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a 3'-substituted nucleoside derivative represented by the following general formula (1): wherein B means a nucleic acid base which may have a substituent, Z represents a lower alkynyl or lower alkenyl group which may be substituted by a group represented by the formula:, in which R a, R b and R c are individually a lower alkyl group or a phenyl group, or an oxiranyl group which may have at least one lower alkyl group, R1 and R2 individually represent H or an ester-forming residue that is easily eliminated in vivo, and R3 is H, a mono- or polyphosphoric acid residue, or an ester-forming residue that is easily eliminated in vivo, with the proviso that the sugar moiety …
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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 December 13, 1995 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2017.
- 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.