Antibacterial 5-alkylquinolonecarboxylic acids
CA 2013449 C · Owner: Schenke, Thomas · Inventors: Endermann, Rainer; Zeiler, Hans-Joachim; Metzger, Karl G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Antibacterial 5-alkylquinolonecarboxylic acids of the formula, in which, R3 is C1-C4-alkyl R1 is optionally substituted alkyl or, cycloalkyl alkenyl, alkoxy, amino or, alkylamino or optionally substituted phenyl R2 is hydrogen or optionally substituted alkyl R4 is a nitrogen-containing heterocyclic radical and, A is hydrogen, halogen, methyl, cyano or nitro or forms a bridge with R1. and hydrates and salts thereof.
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 March 30, 1990 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 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.