N-phenyltetrahydroindazole derivatives
CA 2007172 C · Owner: Wuerzer, Bruno · Inventors: Eicken, Karl; Westphalen, Karl-Otto; Wuerzer, Bruno
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
N-Phenyltetrahydroindazole derivatives of the general formulae Ia and Ib (see fig. I and II), where, R1 is hydrogen or fluorine R2 is halogen, R3 is hydrogen, halogen or a C1-C4-alkyl R4, R5 are hydrogen, C1-C8-alkyl, C2-C4-alkyl which carries a hydroxyl C1-C4-alkoxy or C1-C4-alkylthio radical C1-C6-alkoxy, C3-C6-alkenyl, C3-C6-alkynyl C3-C6-alkenyloxy and/or C3-C6-alkynyloxy or together with the nitrogen atom form a 5- or 6-membered aliphatic ring in which a methylene group may be replaced by an oxygen atom, and, R6 is hydrogen, C1-C6-alkyl which is unsubstituted or substituted by one or two C1-C4-alkoxy groups, or is C3-C6-alkenyl C3-C6-alkynyl or benzyl, processes for their manufacture …
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 4, 1990 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2012.
- 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.