Composite ion exchange membrane
CA 2387210 A1 · Owner: Ballard Power Systems Inc. · Inventors: Summers, David A.; Stone, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite membrane for use in a fuel cell membrane electrode assembly comprises a porous polymeric substrate and an impregnant partially filling the, substrate such that the substrate comprises a first region having pores substantially filled, with the impregnant and a second substantially porous region. The impregnant comprises a ration exchange material. The ration exchange material covers one surface, of the substrate in a dense surface layer contiguous with the first region of , the substrate. The substrate has greater than 10% residual porosity and the composite , membrane is, substantially gas impermeable and has at least one substantially porous major surface.
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
- Filed May 22, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 22, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2024.
- 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.