Obtaining argon using a three-column system for the fractionation of air and a crude argon column
CA 2378017 A1 · Owner: Linde Aktiengesellschaft · Inventors: Pompl, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process and the apparatus are used to obtain argon using a three-column system for the fractionation of air, which has a high-pressure column (11) a low-, pressure column (13) and a medium-pressure column (12). A first charge air stream (10 64) is introduced into, the high-pressure column (11) where it is separated, into a first oxygen-enriched liquid and a first nitrogen top gas. A first oxygen-enriched fraction (23 24, 26) from the high-pressure column (11) is introduced into the medium-pressure column (12) where, it is separated into a second oxygen-enriched liquid and a second nitrogen top gas. A second oxygen-enriched fraction (33, 35), from the high-pressure column and/or from the …
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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 March 21, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 21, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2024.
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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.