Method for removing nitrogen oxides from a gas mixture
CA 1061519 A · Owner: Kureha Kagaku Kogyo Kabushiki Kaisha · Inventors: Nakamura, Tadashi; Watanabe, Tetsuya; Konno, Koji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is described for removing nitrogen oxides from a gas containing nitrogen oxides. Contacting the gas mixture with an aqueous scrubbing solution containing at least ferrous salt and alkali salt of sulfurous acid said, ferrous salt content being at least 0.02% by weight and said alkali salt of sulfurous acid content being at least 0.2% by weight to absorb the nitrogen oxides, thereby forming an alkali salt of imidodisulfonic acid. The solution containing the alkali salt of imidodisulfonic acid is then cooled to solidify the alkali salt, which is separated from the solution.
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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
- Granted September 4, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 4, 1996.
- 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.