Chromatography columns with continuous beds formed in situ from aqueous solutions
CA 2225703 C · Owner: Liao, Jia-Li · Inventors: Liao, Jia-Li; Hjerten, Stellan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chromatography column with a continuous solid bed spanning the cross section of the column, the bed containing channels large enough for hydrodynamic flow is prepared, by polymerizing a mixture of monomers and ammonium sulfate in an aqueous solution. The monomers include a monofunctional monomer such as a vinyl allyl, acrylic, or, methacrylic compound and a polyfunctional monomer (i.e. a crosslinker) the total, monomer concentration being in the range of 10% to 20% by weight the mole ratio of, crosslinker to total monomer being in the range of 0.3 to 0.4 and the ammonium sulfate, having a concentration in the range of 0.4 M to 0.8 M. Functional groups to impart specialized separation …
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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 December 22, 1997 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2019.
- 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.