Substituted 5-aminopyrazoles
CA 2097418 A1 · Owner: Hagen, Helmut · Inventors: Hagen, Helmut; Nilz, Gerhard; Walter, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substituted 5-aminopyrazols have formula (I) in which R1, stands for C1-C8-alkyl, C1-C8-hydroxyalkyl phenyl, that can, also carry 1-3 of the following residues: halogen nitro, alkyl, halogen alkyl, alkoxy, halogen alkoxy alkylthio or -NR6R7, and that can in addition carry as many halogen atoms as necessary for the total number of residues to be 5; R6 R7 stand for H, C1-C4-alkyl; R2 stands for H C1-C4-alkyl, C1-C4-halogen alkyl; R3 stands for CN -CO-R8, -CS-R8; R8 stands , for OH, C1-C4-alkoxy NH2, C1-C4-alkylamino, di-(C1-C4)-alkylamino; R4 R5 stand for H, C1-C4-alkyl, -PX(OR9)2 -SO2-R9, -CX-R10, -CX-NH-CY-R9, CX-NH-SO2-R11; X Y stand for O, S; R9 stands for one of the substituents named …
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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 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2013.
- 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.