Acetanilide derivatives
CA 2113913 A1 · Owner: Zeneca Limited · Inventors: Crawley, Graham Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns acetanilide derivatives of the formula I, I, wherein R4 is (1-4C)alkyl; R5 is hydrogen or (1-4C)alkyl;, Ar1 is phenylene pyridinediyl or pyrimidinediyl;, A1 is a direct link to X1 or A1 is (1-4C)alkylene; X1 is oxy, thio, sulphinyl or sulphonyl; Ar2 is thiophenediyl, furandiyl, thiazolediyl oxazolediyl, thiadiazolediyl or oxadiazolediyl; R1 and R2 together form a group of the formula -A2-X2-A3- which together with the oxygen atom to which A2 is attached and with the carbon atom to which A3 is attached define a ring having 5 or 6 ring atoms, wherein each of A2 and A3 is (1-3C)alkylene and X2 is oxy thio, sulphinyl or sulphonyl and which ring may bear one two or three, …
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 January 20, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2016.
- 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.