Purification and crystallization process for riboflavin
CA 2282908 A1 · Owner: Wagner, Gerhard · Inventors: Wagner, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the purification and crystallization of riboflavin comprises dissolving, needle-shaped riboflavin of the stable modification A in an aqueous mineral acid solution, at a temperature not exceeding about 30°C with intensive intermixing adding active, charcoal to the resulting solution after adsorption of the dissolved , impurities from the solution on the active charcoal subjecting the medium containing the active charcoal to a, counter-current filtration over a ceramic membrane having a pore size of about 20 to, about 200 nm, treating the resulting filtrate with a five- to ten-fold amount (vol./vol.) of, water at a temperature not exceeding about 30°C and separating the …
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 20, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 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.