Method of improving characteristic of cation-exchange membrane
CA 1102971 A · Owner: Toyo Soda Manufacturing Co. Ltd. · Inventors: Seita, Toru; Shimizu, Akihiko; Asami, Shunichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A homogeneous cation-exchange membrane made of at least one fluorinated polymer having cation-exchangeable groups is swollen with a water miscible organic solvent the solvent, is then removed from the swollen membrane and membrane is then treated with hydrochloric acid. The cation-exchange membrane of the fluorinated polymer having cation-exchangeable groups is modified to reduce the permeability of hydroxyl group ions by swelling it, removing the water-miscible organic solvent and then treating it with hydrochloric acid.
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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 June 16, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 1998.
- 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.