Method for processing ion-exchange membrane, the ion-exchange membrane and fuel cells using same
CA 2068071 A1 · Owner: Uchida, Makoto · Inventors: Aoyama, Yuko; Eda, Nobuo; Uchida, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Provided is a method for processing anionexchange membrane which comprises immersing an ionexchange membrane having a fluorine-containing polymer as matrix in a water-soluble organic solvent or an aqueous solution thereof to swell the membrane and then rolling, or stretching the membrane to reduce the thickness thereof. The resulting ion-exchange membrane is improved in water content and is low in sheet resistance and ionexchange membrane fuel cells in which said membrane used are excellent in discharge characteristics.
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 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2014.
- 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.