Displacement chromatography process
CA 2106612 C · Owner: Ashraf, Salman · Inventors: Magnin, Anthony; Wiffen, Diane; Pliura, Diana
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hemoglobin is purified from a crude solution thereof to obtain an aqueous solution containing at least 99% of a preselected hemoglobin species by a two stage displacement chromatography process. One of the stages is conducted under anionic exchange conditions and the other under cationic exchange conditions. In both stages the exchange column is overloaded to displace the hemoglobin species therefrom with contaminants having greater affinity for the column and using the impure hemoglobin solution as the displaces. Normally anionic exchange is conducted first, with contaminants more acidic than the hemoglobin displacing the hemoglobin from the column and themselves remaining attached to 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 21, 1993 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 21, 2015.
- 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.