Method of purifying ferment-produced riboflavin
CA 2046128 C · Owner: Kiefer, Hans · Inventors: Martin, Christoph; Grimmer, Johannes; Kiefer, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of purifying ferment-produced riboflavin wherein the impure , riboflavin is suspended in water or dilute aqueous acid and the suspension, is heated at a temperature of from 75° to 130°C for from 0,3 to 3 hours, with stirring, during which time crystal transformation takes place after which the mixture is cooled and the purified product is isolated in known manner.
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 July 3, 1991 and granted May 8, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 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.