Displacement chromatography of proteins using low molecular weight displacers
CA 2183160 C · Owner: Moore, James A. · Inventors: Li, Yufei; Moore, James A.; Kundu, Amitava
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the purification of proteins by displacement chromatography on ion exchange media using molecular weight displacers is disclosed. Several classes of low molecular weight, charged species are exemplified including aminoacids, peptides, antibiotics and dendrimeric polymers. Novel compounds useful as displacers are dendrimers of formula (I) wherein R1 is lower alkyl, n is 2 to 6 and X is, a common counter anion and similar dendritic polymers based thereon.
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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 February 16, 1995 and granted December 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2017.
- 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
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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.