3-(1-pyrazolyl)-pyridazine derivatives and process for their preparation
CA 1090337 A · Owner: Richter Gedeon Vegyeszeti Gyar Rt · Inventors: Kovacs, Ilona (Nee Szabo); Tardos, Laszlo; Kasztreiner, Endre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to compounds of general formula I, wherein R1 stands for a hydrogen atom or a C1-6 alkyla, C2-4 hydroxyalkyl, a C3-6 cycloalkyl or a phenyl group, R2 stands for hydrogen, fluorine chlorine or bromine, atom or a C1-6 alkyl a C2-4 hydroxyalkyl, a nitro, or an -NR5R6 group wherein R5 and R6 may have, the same or different meaning and stand each for a hydrogen atom or a C1-4 alkyl or C2-4 hydroxyalkyl group, R3 stands for a hydrogen atom or a C1-6 alkyl a, C2-4 hydroxyalkyl, a C3-6 cycloalkyl or a phenyl group a chlorine atom or a hydroxyl, amino or methoxy group, R4 stands for a carbamoyl a cyano or an -NR7-NHR8, group, wherein R7 and R8 may have the same or - 2 -, …
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
- Granted November 25, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 25, 1997.
- 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.