Cation exchange membrane of a fluorocarbon polymer and a process for preparing the same
CA 1165066 A · Owner: Asahi Kasei Kogyo Kabushiki Kaisha · Inventors: Hane, Toshioki; Ohmura, Jukichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cation exchange membrane of a fluorocarbon polymer containing pendant carboxylic acid and/or carboxylate groups preferably, having, at a predetermined ratio pendant carboxylic acid, and/or carboxylate groups and pendant sulfonic acid and/or sulfonate groups uniformly distributed therein,is produced by contacting with a reducing agent a fluorocarbon polymer containing pendant groups of the formula: -O(CF2) mSO2X, wherein X is a fluorine atom a chlorine atom, a hydrogen, atom, M or OM in which M represents. a hydrogen atom a metal atom or an ammonium group, and m is as defined above, and transforming the resultant to a film. An excellent double-layer type composite cation exchange membrane …
Read the whole patent
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 April 10, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 10, 2001.
- 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.