Process and apparatus for reducing the content of nox and n2o in gases
CA 2489109 C · Owner: Schwefer, Meinhard · Inventors: Groves, Michael; Schwefer, Meinhard; Siefert, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process comprises passing the N2O- and NO xcontaining gas over a sequence of two catalyst beds comprising one or more iron-laden zeolites adding a , reducing agent for NO x between the catalyst beds setting a temperature of less than 500°C in the first catalyst bed and second catalyst bed, setting a gas pressure of at least 2 bar in the two catalyst beds and selecting a space velocity in the first and second catalyst beds such that a reduction in the N2O content of the gas by not more than 90%, based on the N2O content at the entrance to the first catalyst bed occurs in the first catalyst bed and that a further reduction in the N2O content of the gas by at least 30%, based on …
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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 June 10, 2003 and granted March 27, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 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
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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.