Azetidinone compound and process for preparation thereof
CA 2102772 C · Owner: Kondo, Kazuhiko · Inventors: Kondo, Kazuhiko; Iwasaki, Tameo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to an azetidinone compound of the formula I: (see formula I) wherein Ring B is a benzene ring which may have substituent(s) R1 is a hydroxy-substituted lower alkyl group which may have substituent(s) X is an oxygen atom and the like, Y is an oxygen atom and the like and Z is a methylene group which may have substituent(s). The compound of the present invention is useful as a synthetic intermediate of the 1.beta.-methylcarbapenem-type antibacterial agent.
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 November 9, 1993 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2015.
- 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.