Mixtures comprising vinyl-containing sulphonic acid, polymer electrolyte membranes comprising polyvinylsulphonic acid and their use in fuel cells
CA 2477863 A1 · Owner: Pemeas Gmbh · Inventors: Kiefer, Joachim; Uensal, Oemer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a proton conducting polymer membrane based on polyvinylsulphonic acid obtained by a method comprising the following steps: A) mixing a polymer with sulphonic acid containing vinyl B) forming a flat , structure by using the inventive mixture from step A) on a support C) , polymerisation of the vinylsulphonic acid present in the flat structure according to step B).The inventive membrane can be applied in a varied manner on account of the excellent chemical and thermal properties thereof and is particularly suitable for use as a polymer-electrolyte-membrane (PEM) in PEMfuel cells.
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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 March 4, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2025.
- 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.