Purinyl and pyrimidinyl tetrahydrofurans
CA 2012851 C · Owner: Zahler, Robert · Inventors: Zahler, Robert; Tino, Joseph A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Antiviral activity is exhibited by compounds having the formula, (see formula I), and pharmaceutically acceptable salts thereof wherein R1 is a purine or pyrimidine base or an analog thereof and R2 and R3 are independently hydrogen, -PO3H2 or (see formula II) wherein X7 is hydrogen alkyl, substituted alkyl and aryl.
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 March 22, 1990 and granted July 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 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.