Anhydrides of 1-ethyl-6-fluoro-7-chloro-4-oxo-1,4- dihydroquinoline-3-carboxylic acids and boric acids
CA 1284800 C · Owner: Chinoin Gyogyszer Es Vegyeszeti Termekek Gyara · Inventors: Sipos, Judit; Kovacs, Gabor; Horvath, Agnes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of compounds of the general formula I /I/, (wherein R and R1 stand for an aliphatic acyloxy group comprising 2-5 carbon atoms and optionally substituted by halogen or for an aromatic acyloxy group comprising 7-11 carbon atoms), which comprises reacting a compound of the general Formula II, /II/, (wherein R2 stands for hydrogen or alkyl comprising 1-4 carbon atoms) with a borone derivative of the general Formula III, /III/, (wherein R3, R4 and R5 stand for an alkyl group comprising 1-4 carbon atoms and optionally substituted by halogen or for an aryl group comprising 6-10 carbon atoms). The new compounds of the general Formula I are …
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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 June 11, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 11, 2008.
- 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.