Process for preparing fluorine-containing polymers having carboxyl groups
CA 1134993 A · Owner: Tokuyama Soda Kabushiki Kaisha · Inventors: Sata, Toshikatsu; Onoue, Yasuharu; Nakahara, Akihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is a process for preparing a fluorine-containing polymer having carboxyl groups, which comprises subjecting a fluorinecontaining polymer having sulfonyl halide groups bonded to it to an oxidation reaction at a temperature of not more than 250°C. The fluorine-containing polymer produced are suitable materials for use in ion exchange membranes.
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 November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 1999.
- 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.