Phosphonomethoxytetrahydrofuranyl-purine/pyrimidine derivatives
CA 2015671 C · Owner: Martin, John C. · Inventors: Luh, Bing Y.; Martin, John C.; Misco, Peter F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the following formulas which have anti-tumor and anti-viral activity and are especially useful in treating viral infections, their compositions and use. A phosphonomethoxymethyoxymethyl purine/pyrimidine derivative of the formula, wherein X and X' are the same or different and are hydrogen or alkyl. R and R' are the same or different and are hydrogen alkyl, hydroxyalkyl or R"CO-where R" is an alkyl and B is a purine or pyrimidine base. A 4'-phosphonomethoxytetrahydrofuranyl-1'-purine-pyrimidine of the formula, wherein X and X' are the same or different and are hydrogen or alkyl, Y and Z are the same of different and are hydrogen hydroxyl or alkyl or Y + Z is an alkenyl an …
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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 27, 1990 and granted April 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2012.
- 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.