Separation of air
CA 2267805 A1 · Owner: Hine, Christopher John · Inventors: Hine, Christopher John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Air is separated by rectification. The air is compressed in a main air compressor 2 to, a first pressure. Without further compression a first flow of the compressed air is, cooled in a main heat exchanger 6 to a temperature suitable for its separation by, rectification. The first flow is introduced into the higher pressure column 16 of a, double rectification column 14 comprising in addition to the higher pressure , column 16, a lower pressure column 18, in which a bottom oxygen fraction containing from, 50 to 96 mole per cent of oxygen is formed and a condenser-reboiler 20 , placing the higher pressure column 16 in heat exchange relationship with the lower pressure, rectification …
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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 31, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 31, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 31, 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.