4-phenyl-pyridine derivatives
CA 2299139 C · Owner: Schnider, Patrick · Inventors: Hoffmann, Torsten; Stadler, Heinz; Galley, Guido
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to compounds of the general formula (see formula I) , wherein, R is hydrogen lower alkyl, lower alkoxy, halogen or trifluoromethyl; R1 is hydrogen or halogen; or, R and R1 when adjacent, may be together -CH=CH-CH=CH-; R2 and R2' are independently from each other hydrogen halogen, trifluoromethyl, lower alkoxy or cyano; or R2 and R2', when adjacent, may be together -CH=CH-CH-CHoptionally , substituted by , one or two substituents selected from lower alkyl or lower alkoxy; R3 and R3' are each hydrogen, lower alkyl or together with the carbon to which they are , attached form a cycloalkyl group; R4 is hydrogen, -N(R)2, -N(R5)(CH2)n OH -N(R5)S(O)2-lower alkyl, …
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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 February 23, 2000 and granted March 29, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2022.
- 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.