Method for removing sulfur dioxide and nitrogen oxides from combustion gases
CA 2210574 A1 · Owner: Lani, Bruce W. · Inventors: Lani, Bruce W.; Babu, Manyam
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of removing sulfur dioxide and nitrogen oxides from a gaseous stream where an alkaline earth compound is added either in a wet scrubbing unit which substantially saturates the gaseous stream with water, or to a gaseous stream to which water has been added, and the gaseous stream then exposed to a coronal discharge, with dry calcium hydroxide added which reacts with nitric acid formed by the coronal discharge to form calcium nitrate. Alkaline earth sulfites or sulfates formed by reaction, of the alkaline earth compound with sulfur dioxide are removed from the gaseous stream and calcium nitrate formed by reaction of, injected dry calcium hydroxide with the nitric acid produced are …
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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 July 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 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.