Process for producing magnesium sulfite hexahydrate in a flue gas desulfurization system
CA 2133694 C · Owner: Berisko, Daniel W. · Inventors: Berisko, Daniel W.; College, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for removing sulfur dioxide from a flue gas stream where the magnesium sulfite removed from the effluent of a wet scrubber is in the form of magnesium sulfite hexahydrate. The chemistry of the aqueous scrubbing medium is controlled with specified ranges of magnesium ion content sulfite ion content and, pH. A portion of the aqueous solution removed from the scrubber is cooled, and solids crystallized therefrom in the form of magnesium, sulfite hexahydrate.
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 October 5, 1994 and granted April 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 5, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2016.
- 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.