Chiral 2-(phosphonomethoxy)propyl guanines as antiviral agents
CA 2040854 C · Owner: Bronson, Joanne J. · Inventors: Martin, John C.; Bronson, Joanne J.; Yu, Kuo-Long
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a chiral nucleotide analog having the formula I, (see formula I) which is substantially free of the (S)-isomer and pharmaceutically acceptable salts and solvates thereof and, their pharmaceutical compositions which is useful in the, treatment of viral infections especially those caused by, human immunodeficiency virus (HIV).
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, 1991 and granted November 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 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.
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.