Heterocycles
CA 2009902 C · Owner: Crawley, Graham C. · Inventors: Edwards, Philip N.; Girodeau, Jean-Marc M. M.; Crawley, Graham C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a heterocycle of the formula wherein Q is an optionally substituted 6-membered monocyclic or 10-membered bicyclic heterocyclic moiety containing one or two nitrogen atoms; A is (1-6C)alkylene (3-6C)alkenylene, (3-6C)alkynylene or cyclo(3-6C)alkylene; X is oxy thio, sulphinyl, sulphonyl or amino; Ar is phenylene which may optionally bear one or two substituents or Ar is an optionally substituted 6-membered heterocyclene moiety containing up to three nitrogen atoms; R1 is hydrogen (1-6C), alkyl, (3-6C)alkenyl, (3-6C)alkynyl cyano-(1-4C)alkyl or, (2-4C)alkanoyl, or optionally substituted benzoyl; and R2 and R3 together form a group of the formula -A2-X2-A3- which …
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 February 13, 1990 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 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.