Method for crystallising carboxylic acid
CA 2343012 A1 · Owner: Fache, Eric · Inventors: Fache, Eric; Costantini, Michel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for crystallising carboxylic acid more particularly adipic acid and a method for making crystallised carboxylic acid more specifically a method for treating a reaction medium derived from direct oxidation of a hydrocarbon into carboxylic acid such as adipic acid for example. More specifically, the invention concerns the crystallisation of adipic acid in an organic solvent for eliminating organic impurities contained in said acid and thereby ultimately facilitating its purification by crystallisation in water.
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 September 14, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 14, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 2021.
- 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.