Expired Canadian patentCanada
Methods for the manufacture of quinolone carboxylic acids derivatives and intermediates thereof
CA 2199645 C · Owner: Karimian, Khashayar · Inventors: Egle, Ian; Tam, Tim Fat; Leung-Toung, C.S.H. Regis
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Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel process for the preparation of quinolone carboxylic acid derivatives of general formula I, and intermediates thereof as illustrated in Scheme 1 wherein the key intermediate is a compound of formula IX. (see fig. I)
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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
- Filed March 11, 1997 and granted June 29, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 11, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 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.
FiledMarch 11, 1997
GrantedJune 29, 1999
Term endedMarch 11, 2017
Patent numberCA 2199645 C
Classification (IPC)C07D215/56 +2 more
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.