Enantiomerically pure .beta.-d-dioxolane nucleosides with selective anti-hepatitis b virus activity
CA 2268703 C · Owner: Schinazi, Raymond F. · Inventors: Schinazi, Raymond F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A .beta.-D-dioxolanyl nucleoside of the formula: (see formula I), wherein R is H, OH, Cl or NH2 and X is selected from the group consisting of hydrogen, acyl, monophosphate diphosphate and triphosphate, or a pharmaceutically acceptable salt thereof, is used for the treatment of HBV infection in a human or other host animal.
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 October 28, 1993 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 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.