Expired Canadian patentCanada
Anti-viral compounds
CA 2098020 C · Owner: Merrell Dow Pharmaceuticals Inc. · Inventors: Van Dorsselaer, Viviane; Tarnus, Celine; Schirlin, Daniel
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to novel difluoro statone analogs of Formula 1, to the processes and intermediates useful for their preparation and to their use as anti-viral agents. (see Formula I)
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 December 20, 1991 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 20, 1991
GrantedOctober 21, 2003
Term endedDecember 20, 2011
Patent numberCA 2098020 C
Classification (IPC)C07C271/20 +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.