Intermediates for preparing 1,4-dihydro-4-oxo- quinoline-3-carboxylic acid esters
CA 1331185 C · Owner: Hecker, Scott J. · Inventors: Busch, Frank R.; Hecker, Scott J.; O'Neill, Brian T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
INTERMEDIATES FOR PREPARING, 1,4-DIHYDRO-4-OXO-QUINOLINE-3- CARBOXYLIC ACID ESTERS, Abstract, Compounds of the formula: IV, wherein Y is OR1, fluoro, chloro, methyl - ? - ? - OR2, , or, ;, ;, R1, and R3 are independently selected from hydrogen and C1-C4 alkyl, R2 is C1-C4 alkyl and X is fluoro chloro, or bromo, with the proviso that when Y is OH X cannot, be bromo and with the proviso that X can be fluoro only if R2 is methyl.
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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 August 2, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 2, 2011.
- 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.