Process for decreasing the resistivity of conductive flow field plates for use in fuel cells
CA 2479874 A1 · Owner: Cai, Yuqi · Inventors: Cai, Yuqi; Fisher, John; Chopra, Divya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for decreasing the resistivity of a non-machined conductive flow field plate for use in a fuel cell. The flow filed plate may contain graphite filled polymer. The process includes the step of annealing the conductive flow field plate by heating the conductive flow field plate to a temperature between 25 ~C (room temperature) and a temperature slightly lower than the material softening temperature of the material composition of the conductive flow field plate; maintaining the conductive flow field plate at that temperature for an effective period of time; and, cooling the conductive flow field plate to room temperature.
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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 17, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 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.