Air ejector system for fuel cell passivation
CA 2048674 A1 · Owner: International Fuel Cells Corporation · Inventors: Scheffler, Glenn W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fuel cell (10) system in which a nitrogen (N2) gas is used on the anode section (11) and a nitrogen/oxygen (N2/O2) gaseous mix is used on the cathode section (12) to maintain the cathode at an acceptable voltage potential during adverse conditions occurring particularly during off-power conditions for example, during power plant shutdown start-up and hot holds. During power, plant shutdown the cathode section is purged with a gaseous mixture of, for example, one-half percent (0.5 %) oxygen (O2) and ninety-nine and a half percent (99.5 %) nitrogen (N2) supplied from an ejector (21) bleeding in air (24/28) into a high pressure stream (27) of nitrogen (N2) as the primary or majority gas. …
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 December 7, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2012.
- 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.