Continuous production of aqueous solutions of alkaline salts of arylacetic acids
CA 2238398 A1 · Owner: Elf Atochem S.A. · Inventors: Corbiere, Philippe; Ruppin, Christophe; Gendarme, Jean-Philippe
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 continuous production of an aqueous solution of the alkaline salt of arylacetic acid by alkaline hydrolysis of an aryl acetonitrile. The process consists in contacting an arylacetonitrile with an aqueous solution of an alkaline hydroxide in a mixing zone introducing the mixture obtained into a reaction zone transferring the reaction medium to a separation zone and then a stripping zone and recovering the aqueous solution of the alkaline salt of arylacetic acid which may be neutralized and diluted. The invention also relates to an installation for implementing the process.
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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 May 21, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2020.
- 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
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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.