Asymmetric semi-permeable membrane having high salt rejection
CA 1280262 C · Owner: Smith, John W. · Inventors: Hann, Richard A.; Smith, John W.; Holmes, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An Asymmetric Semi-Permeable Membrane Having High Salt Rejection An asymmetric membrane formed from a sulphonated polyarylethersulphone has a salt rejection of at least 99%. Alternatively a membrane has a good salt rejection and an acceptable water flux such that the ratio, has the value of at least 0.7. The membranes can be obtained using barium salts of the sulphonated polyarylethersulphone with the, proportion of barium being controlled to be at least 85% preferably, at least 86%, and not more than 91% preferably not more than 90% of, the barium required to react with the sulphonic acid groups on the sulphonated polymer. me membranes have high salt rejection at a high water flux and are …
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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 February 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 2008.
- 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.