Quinolonecarboxylic acid derivatives or salts thereof
CA 2242242 C · Owner: Hayashi, Kazuya · Inventors: Watanabe, Yasuo; Hayashi, Kazuya; Todo, Yozo
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 quinolonecarboxylic acid derivative represented by the general formula 1, or its salt:, (see formula I) Of the compounds of the present invention preferable are compounds in which R2 represents a substituted or unsubstituted cycloalkyl group; R3 represents at least one member selected from the group consisting of a hydrogen atom, a halogen atom a, substituted or unsubstituted lower alkyl or lower alkoxy group, and a protected or unprotected hydroxyl or amino group; R4 represents a hydrogen atom or a substituted or unsubstituted lower alkyl group; each of R5 and R6 represents a hydrogen atom; and A represents C-Y in which Y represents a halogen atom, a …
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 February 7, 1997 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2019.
- 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.