Process for the preparation of nucleosides
CA 2092038 C · Owner: Novartis Ag · Inventors: Brill, Wolfgang K.-D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of natural or synthetic nucleosides nucleoside , analogs or, oligonucleotides from at least two such nucleosides and/or nucleoside analogs whose basic, molecule contains an unsubstituted or substituted radical of a nucleic base B and a, protected hydroxyl group of formula R1-Owherein R1 is a protective group, or which are linked to the oxygen atom of a hydroxyl group direct or to a solid support through a, linking group, from nucleoside monomers or from oligonucleotides to the basic molecule, of which, in addition to said radicals a group of formula I, Ia or Ib, is attached by converting the group of formula I, Ia or Ib into a hydroxyl group -OH by, …
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 19, 1993 and granted December 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 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.