Production of citric acid
CA 2043152 C · Owner: Baniel, Avraham · Inventors: Baniel, Avraham; Gonen, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process comprises, i) subjecting said citric acid fermentation broth to evaporation to produce a concentrate with a citric acid concentration of at least 80% of the saturation value at the evaporation temperature;, ii) subjecting such concentrate to an extraction operation with a recycled amine extractant citric acid solution in which the citric acid concentration is below the equilibrium value which corresponds to the broth concentrate at the extraction temperature to produce a, more concentrated amine extractant citric acid solution and an aqueous citric acid raffinate;, iii) withdrawing the aqueous extraction raffinate from said extraction operation, bleeding off a small fraction …
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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 23, 1991 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2013.
- 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.