Expired Canadian patentCanada
Therapeutic nucleosides
CA 2105486 C · Owner: The Wellcome Foundation Limited · Inventors: Painter, George Robert Iii; Furman, Phillip Allen
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use of a 1,3-oxathiolane nucleoside analogue and pharmaceutically acceptable derivatives thereof for the treatment of hepatitis B virus infections is disclosed. Pharmaceutical formulations are also provided.
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 5, 1992 and granted October 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2014.
- 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 5, 1992
GrantedOctober 28, 2003
Term endedMarch 5, 2012
Patent numberCA 2105486 C
Classification (IPC)A61K31/70 +2 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.