Films of fluorinated polymer containing sulfonyl groups
CA 1133668 B · Owner: E. I. Du Pont De Nemours And Company · Inventors: Grot, Walther G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A film useful as an ion exchange membrane of fluorinated polymer containing pendant side chains containing sulfonyl groups which are attached to carbon atoms which have at least one fluorine atom attached thereto; one surface of the film having a majority of the sulfonyl groups of the polymer in the -(SO2NH)mQ form wherein Q is H, NH4, cation of an alkali metal and/or cation of alkaline earth metal and m is the valence of Q and the other surface of the film having the sulfonyl groups in the -(SO3)nMe form wherein Me is a cation and n is the valence of the cation and processes for preparing the film. ABSTRACT
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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 23, 1976. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 1993.
- 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.