Improved process for the synthesis of 2'-o-substituted pyrimidines and oligomeric compounds therefrom
CA 2214535 C · Owner: Sprankle, Kelly G. · Inventors: Griffey, Rich H.; Sprankle, Kelly G.; Cook, Phillip Dan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved processes for the synthesis of 2'-O-substituted pyrimidine nucleosides and oligomeric compounds having these nucleosides are disclosed. The synthetic processes feature alkylation of a 2,2'-anhydropyrimidine nucleoside or a 2S,2'-anhydropyrimidine nucleoside with a weak nucleophile in the presence of a Lewis acid.
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 March 6, 1996 and granted November 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 2018.
- 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.