Method for extracting 2-ketone-l-gulonic acid from a polar, preferably aqueous solvent
CA 2510026 A1 · Owner: Sauer, Friedrich · Inventors: Domschke, Thomas; Sauer, Friedrich; Merger, Martin
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 method for extracting 2-ketone-L-gulonic acids from a polar, preferably aqueous solvent, preferably from a solvent which contains a mixture of ascorbic acid and 2-ketone-L-gulonic acid by means of liquid-, liquid extraction with the aid of an extraction agent which contains a tertiary amine and a polar organic diluent. Preferably the inventive method , also comprises steps for retro-extracting the 2-ketone-L-gulonic acid and for returning the extraction agent. The invention also relates to a method for producing ascorbic acid from 2-ketone-L-gulonic acid and for isolating the thus produced ascorbic acid.
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 December 13, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 13, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2025.
- 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.