Apparatus and method for reducing nox emissions
CA 2036612 C · Owner: Breen, Bernard P. · Inventors: Winberg, Steven E.; Breen, Bernard P.; Mcmichael, James C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method for reducing NOX emissions from furnace flue gas are provided in which a stream of natural gas or other fluid fuel which has little or no fixed nitrogen is introduced into the upper portion of the furnace. The fuel stream has sufficient turbulence to form eddies surrounded by the flue gas so that the fuel reacts with the nitrogen oxides in the flue gas to form ammonia-like and cyanide-like compounds and nitrogen gas. The ammonia-like and cyanide-like compounds react with additional amounts of nitrogen oxides in the flue gas to form nitrogen gas, water vapor and carbon dioxide. In this manner the amount of nitrogen oxides in the flue gas is reduced. The invention can be …
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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 February 19, 1991 and granted February 10, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2013.
- 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.