Apparatus for concentrating and purifying sulfuric acid
CA 2262265 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Lailach, Gunter; Renner, Michael; Savakis, Stylianos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and process for concentrating sulfuric acid to an H2SO4 content of 95 to, 98% and optionally for purifying the sulfuric acid at a temperature of 270 to 340°C are, described. The apparatus consists at least of a naturally circulating evaporator system, (4, 5; 6: 7; 1; 13) comprising a two-part vapour hood (4 5), a heat exchanger , (1), in, particular a shell-and-tube heat exchanger a circulating line (6, 7) and a , distillation column (13), wherein the parts of the apparatus conveying the liquid sulfuric acid at a, temperature of 270 to 340°C comprising the lower part of the vapour hood (4), heat, exchanger (1) and circulating line (6 7) consist of an austenitic/ferritic , …
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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, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 19, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 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
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.