Triazolopyrimidine derivatives
CA 2086404 C · Owner: Shell Internationale Research Maatschappij B.V. · Inventors: Albert, Guido; Pees, Klaus-Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to certain triazolopyrimidine derivatives of the general formula, (see formula I) in which R1 represents an optionally substituted alkyl alkenyl, alkynyl, alkadienyl, cycloalkyl bicycloalkyl or heterocyclyl, group; R2 represents a hydrogen atom or an alkyl group; or R1 and R2 together with the interjacent nitrogen atom represent an optionally substituted heterocyclic ring; R3 represents an optionally substituted aryl group; and R4 represents a hydrogen or halogen atom or a group -NR5R6 where R5 represents a hydrogen atom or an amino, alkyl, cycloalkyl or bicycloalkyl group and R6 represents a hydrogen atom or an alkyl group; processes for their preparation; …
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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 December 29, 1992 and granted June 10, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 29, 2014.
- 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.