New formulations for polyacrylamide matrices in electrokinetic and chromatographic methodologies
CA 2125136 C · Owner: Righetti, Pier Giorgio · Inventors: Chiari, Marcella; Righetti, Pier Giorgio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Matrices for electrokinetic and chromatographic separations based on a unique , class of mono- and disubstituted (on the amido nitroagen) acrylamides (e.g. acrylamido-N-ethoxy ethanol acrylamido-N, N-di-ethoxy ethanol) offer the following advantages: a) strong resistance to alkaline hydrolysis (most zone separations occurring at basic pH values); b) a high hydrophilicity and c) greater porosity, due to the larger M r value of the monomers. Such matrices can be prepared as 'chemically crosslinked' gels or as 'physical gels', the latter consisting of'strings' of monofunctional monomer in the absence of cross-linker at concentrations above the entanglement threshold. It is moreover possible …
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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 August 5, 1992 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 5, 2014.
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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.