Quinoline carboxylic acid derivatives
CA 2058424 A1 · Owner: Kuraishi, Tadayuki · Inventors: Matsumoto, Masaru; Matsuda, Hideaki; Shibata, Akihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a quinolone carboxylic acid derivative represented by the following the formula (I), (I), wherein R1 is a lower alkyl group R2 is a hydrogen atom, or a lower alkyl group R3 is a hydrogen atom or a halogen, atom R4 and R5 together form a five- or six-membered ring which may contain hetero atoms or may have substituents provided that a compound wherein R1 is a methyl group R2, and R3 are hydrogen atom and , is a piperazinyl group is excluded; or a salt thereof; to an antimicrobial agent comprising the same as an effective component; and to an intermediate for producing same.
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 29, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 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.