Amphoteric ion exchange resins
CA 1090045 A · Owner: Ici Australia Limited · Inventors: Brown, Jerry H.; Wade, Keith O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for making a thermally reversible amphoteric ion exchange resin suitable for use in the demineralization of water which process comprises dispersing particles of an ion exchange resin comprising either weakly basic or weakly acidic ionogenic groups in a solution comprising one or more monomers containing an ionogenic group, or organic precursor thereof of opposite, acid-base character to the ionogenic groups of the ion exchange resin particles, a crosslinking agent comprising two or more vinylic or allylic groups, and a porogen; secondly polymerizing the monomer to give a macroporous crosslinked polymer matrix; and thirdly treating the polymeric composition to convert any organic …
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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
- Granted November 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 18, 1997.
- 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.