Substituted 1,3-oxathiolanes with antiviral properties
CA 2188283 C · Owner: Mansour, Tarek S. · Inventors: Mansour, Tarek S.; Jin, Haolun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to single enantiomers of novel cis-substituted 1,3oxathiolanes, of formula (I) wherein R1 is hydrogen and R2 is cytosine or 5-, fluorocytosine and pharmaceutically acceptable salts and esters thereof. This invention also relates to pharmaceutical compositions containing them and to the use of these compounds as antiviral agents particularly in combination , therapy.
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 April 19, 1995 and granted November 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 19, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 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.