Antiviral agents
CA 2003408 A1 · Owner: Prisbe, Ernest J. · Inventors: Maag, Hans; Verheyden, Julien P.H.; Prisbe, Ernest J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Nucleoside compounds of the formula wherein:, B is guanine, adenine, thymine uracil, cytosine, hypoxanthine, xanthine 5-methylcytosine, 4-ethoxy-, 5-methyl-2-oxo-pyrimidine 4-isopropoxy-5-methyl-2-oxo-, pyrimidine or 5-methyl-2-oxo-pyrimidine;, X is H or F; Y' is H, OH, OCH3 or F; and, Z is , or where n is zero, one, or three and both R' are hydrogen or lower alkyl; or, Y' and Z together form a cyclic phosphate ester and the pharmaceutically acceptable esters ethers and, salts thereof, have been found to have potent antiviral activity with a high therapeutic ratio.
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 November 20, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 2011.
- 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.