Processes for preparing quinoline derivatives and intermediates thereof
CA 2400977 C · Owner: Nissan Chemical Industries, Ltd. · Inventors: Tatsuta, Kuniaki; Tamai, Yoshin; Kikuyama, Shigeki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a production method of quinoline derivative (V), (see formula I) (see formula IV) (see formula II), (see formula III) (see formula V) wherein each symbol is as defined in the Specification which , includes reacting quinolinecarbaldehyde (I) with any of the compounds (II) to (IV) in the presence of a base followed by , hydrolysis.
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 19, 2001 and granted March 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2023.
- 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.