Tetrahydroindazoles with a phenyl ether structure
CA 2006029 C · Owner: Rueb, Lothar · Inventors: Wuerzer, Bruno; Plath, Peter; Westphalen, Karl-Otto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
N-(Phenyl)-tetrahydroindazole derivatives of the general formula Ia and Ib, , where R1 is halogen;, R2 is C1-C6-alkoxycarbonyl-C3-C5-alkenyl or C1-C3-alkyl which is substituted in the 1- or 2-position by C1-C6-alkoxycarbonyl or a 5-or 6-membered saturated or monounsaturated heterocycle which contains one oxygen or sulfur as heteroatom and can be substituted by from one to four C1-C4-alkyls, and, R3 is C2-C7-alkyl C3-C6-alkenyl, C3-C6-alkynyl, C1-C6-alkoxycarbonyl-C3-C5-alkenyl or C1-C3-alkyl which is substituted in the 1- or 2-position by C1-C6-alkoxycarbonyl or a 5- or 6-membered saturated or monounsaturated heterocycle which contains one oxygen or sulfur as heteroatom and can be …
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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 19, 1989 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2011.
- 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.