Polymer electrolyte membrane and solid polymer electrolyte fuel cell using same
CA 2368669 C · Owner: Sohma, Hiroshi · Inventors: Goto, Kohei; Saito, Nobuhiro; Asano, Yoichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite polymer electrolyte membrane is formed from a first polymer electrolyte comprising a sulfonated polyarylene polymer and a second polymer electrolyte comprising another hydrocarbon polymer electrolyte. In the first polymer electrolyte, 2-70 mol% constitutes an aromatic compound unit with an electron-attractive group in its principal chain while 30-98 mol% constitutes an aromatic compound unit without an electron-attractive group in its principal chain. The second polymer electrolyte is a sulfonated polyether or sulfonated polysulfide polymer electrolyte. The composite polymer electrolyte membrane is formed from a matrix comprising the first polymer electrolyte selected …
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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 January 21, 2002 and granted February 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 21, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 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.