Process and device for the production of sulphuric acid
CA 2277577 A1 · Owner: Marechal, Francois · Inventors: Dumont, Marie Noelle; Arpentinier, Philippe; Marechal, Francois
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process and to a device for the production of sulphuric acid. The said process, of the contact process type comprises:, - a first step of production of sulphur dioxide from a sulphur-comprising starting material and from an oxidant;, - a second step of catalytic oxidation of the said sulphur dioxide to sulphur trioxide in a catalytic converter (20', 60') fed with oxygen;, - a third step of production of sulphuric acid from the said sulphur trioxide, the said third step producing, in addition to the said sulphuric acid waste gases. It is characteristically carried out with recycling of a portion of the said waste gases as at least a fraction of the said …
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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 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2021.
- 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.