Ether nitrile co-polymers containing sulfonic acid groups for pem application
CA 2527445 C · Owner: Gao, Yan · Inventors: Gao, Yan; Guiver, Michael D.; Robertson, Gilles P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ether nitrile co-polymers containing sulfonic acid groups including wholly aromatic poly(aryl ether ether nitrile)s containing sulfonic acid groups (SPAEEN)s and poly(phthalazinone ether ketone nitrile) co-polymers containing sulfonic acid groups (SPPEKN)s intended for fuel cells applications as proton conducting membrane materials,were prepared.
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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
- Filed November 18, 2005 and granted January 22, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 18, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.