Separation of proteins and dyes
CA 2089161 C · Owner: Novozymes Delta Limited · Inventors: Johnson, Richard A.; Woodrow, John R.; Quirk, Alan V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Problem: when proteins are purified using a protein-binding; dye immobilised on a chromatographic matrix; the dye or a portion/derivative may leak into the eluant Solution: an ion-exchange resin (e:g. Dowex-I) and a disrupting material (e.g. salt and a fatty acid such as sodium octanoate) are used to separate the dye from the protein.
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 12, 1991 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 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.