Novel process for manufacturing xylose
CA 2019036 C · Owner: Roquette Freres · Inventors: Duflot, Pierrick; Leleu, Jean-Bernard; Caboche, Jean-Jacques
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for manufacture of D-xylose characterized by the fact that:, - in a first step, syrup of D-xylulose is subjected to an enzymatic isomerization providing a mixture of D-xylose and D-xylulose, - in a second step the abovesaid mixture is subjected, to chromatographic treatment leading to at least two fractions of which one is highly enriched in D-xylose (fraction X1) et of which the other is highly enriched in D-xylulose (fraction X2), - in a third step the fraction X2 is recycled to the, first step the D-xylose being recovered from the fraction X1 the, latter can also be subjected directly to a hydrogenation step.
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 June 14, 1990 and granted January 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 2012.
- 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.