New improved ion exchange membranes, their methods of preparation and their uses
CA 2228466 A1 · Owner: Armand, Michel · Inventors: Michot, Christophe; Armand, Michel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Di-functional monomers of general formula T~SO2~Y~SO2T'-M+, where:, - T or T' are identical or different and each represent an organic radical having at least, one polymerization-active function; - M+ represents a cation, inorganic or organic preferably chosen among: H+, Li+, Na+, K+ 1/2Mg2+, 1/2Ca2+, 1/2Ba2+, 1/2Zn2+ and other transition metals 1/3La3+ , and, other rare earths, ammonium amidinium, pyridinium, imidazolium, guanidinium sulfonium, phosphonium, iodonium, organometallic cations all possibly , including, coordination ligands.... - Y represents N (nitrogen) CH, or CQ. - Q represents an alkyl or alkylene with 1 to 20 carbons halogenated or not, possibly, having aza or oxa …
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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 January 30, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2020.
- 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.