N6 heterocyclic substituted adenosine derivatives
CA 2264155 C · Owner: Pfister, Jurg R. · Inventors: Wick, Michael M.; Lum, Robert T.; Schreiner, George F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A substituted N6-oxa, thia, thioxa and azacycloalkyl substituted adenosine derivative of formula (I) and a method for using the composition as an A1 heart adenosine receptor. In said formula R1 is a monocyclic or polycyclic , heterocyclic group containing from 3 to 15 atoms at least one of which is , selected from the group consisting of N O, P and S-(O)o-2 and wherein R1 does not contain an epoxide group.
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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 August 20, 1997 and granted November 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2019.
- 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.