Porous electrode substrate for an electrochemical fuel cell
CA 2274975 C · Owner: Ballard Power Systems Inc. · Inventors: Davis, Michael T.; Campbell, Stephen Alan; Wilkinson, David P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A porous electrode substrate for an electrochemical fuel cell comprises at least one preformed web having low or poor electrical conductivity (e.g. having a through-plane resistivity of greater than 1 ohm.cm). The web contains an electrically conductive filler. A method for preparing a porous electrode substrate for an electrochemical fuel cell comprises the step of filling a preformed web, the web having low or poor electrical conductivity with an , electrically conductive filler.
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 26, 1997 and granted December 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 26, 2019.
- 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.