Membranes
CA 1262994 C · Owner: Hann, Richard A. · Inventors: Hann, Richard A.; Holmes, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
H32942, Abstract, Membranes, Divalent metal salts of sulphonated polyarylethersulphones and solutions thereof in a specified solvent mixture for example a, mixture of an alkylene carbonate an ether and a carboxylic acid, hydroxy-substituted hydrocarbon compound or water can be used to produce membranes, such as asymmetric semi-permeable membranes for reverse osmosis. The divalent metal may be an alkaline earth metal particularly barium. Membranes having a desirable combination of nigh salt rejection at a high water flux are also disclosed. These membranes may be used for the desalination of sea water and purification of brackish waters and industrial effluents.
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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 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 14, 2006.
- 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.