Process for operation of a pem fuel cell unit
CA 2267430 C · Owner: Stuhler, Walter · Inventors: Stuhler, Walter; Keim, Martin; Stenger, Herbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention concerns a process for operating a PEM fuel cell system (2) with at least one PEM fuel cell block (4) and an upstream compressor (8) the rotational speed of which is controlled. To regulate the electrical current I of the PEM fuel cell block (4) to a new set value I SN in a first step, the rotational speed (n) of the compressor (8) is set at a maximum value n M and, in a second step re-, duced to a rotational speed n SN which corresponds to the new set value I SN. These measure provide improved dynamics for brief and rapid changes in load.
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 September 18, 1997 and granted November 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 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.