Pyridonecarboxylic acid derivatives having 3-amino(alkyl)methyl-pyrrolidine
CA 1301760 C · Owner: Daiichi Pharmaceutical Co. Ltd. · Inventors: Atarashi, Shohgo; Hayakawa, Isao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides novel pyridonecarboxylic acid derivatives having a quite high antimicrobial activity. The derivatives have the following formula: I, wherein R1, R2 and R3 represent each a hydrogen or C1 - C6 alkyl group; R4 represents an ethyl, 2-fluoroethyl vinyl, isopropyl, isopropenyl or cyclopropyl group: and X represents CH, C-F, C-C1 or N, characterized in that R2 and R3 are not hydrogen at the same time.
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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
- Granted May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
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Timeline
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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.