Proton-conducting polymer membrane comprising a polymer with sulphonic acid groups and use thereof in fuel cells
CA 2494530 A1 · Owner: Uensal, Oemer · Inventors: Uensal, Oemer; Calundann, Gordon; Kiefer, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to proton-conducting polymer membrane comprising a polymer with sulphonic acid groups which may be obtained by a method comprising the following steps: A) mixing vinylogous sulphonic acids with one or several aromatic tetra-amino compounds with one or several aromatic carboxylic acids, the esters, the acid halides or the acid anhydrides thereof which have at least two acid groups per carboxylic acid monomer and/or mixing of vinylogous sulphonic acids with one or several aromatic and/or heteroaromatic diaminocarboxylic acids the esters, acid halides or acid , anhydrides thereof B) heating the mixture obtained in step (A) under an inert gas to up to 350 ~C with …
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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 July 31, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2025.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.