Propenoic acid derivatives
CA 2103463 A1 · Owner: Richards, Ian Christopher · Inventors: Richards, Ian Christopher; Whalley, Anthony Edward; Simpson, Donald James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I) wherein X is CH or N; n is 0 1, 2 or 3;, R1 and R3, which may be the same or different are alkyl, alkoxy or alkylthio, each of which is optionally substituted halogen, nitro, cyano, COOR4, -NR5R6, CONR5R6 COR7 or, R8S(O)q; or R1 and an adjacent R3 group or two adjacent, R3 groups, together with the carbon atoms to which they are attached can form a 5 to 8 membered ring which can include 1 to 3 heteroatoms and may be substituted; R2 is an optionally substituted aliphatic hydrocarbon radical, which may be unsaturated aryl or , heterocyclyl; R4 is hydrogen or an ester forming group; R5 and R6 are the same or different and are hydrogen optionally, substituted alkyl, …
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 May 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 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.