Air separation
CA 2082676 A1 · Owner: Rathbone, Thomas · Inventors: Rathbone, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air stream is compressed in compressor 2 and purified in unit 4. One subsidiary stream of this air is cooled in heat exchanger 10 to a temperature suitable for its separation by rectification. This subsidiary air stream is separated in a double rectification column 24 comprising a higher pressure stage 18 and a lower pressure stage 20. A secondary subsidiary air stream is further compressed in compressors 42 44, 46 and 48. It is cooled in heat exchanger 10 to a first temperature intermediate ambient temperature and the operating temperature of the column 24. The second subsidiary stream is expanded in an expansion turbine 50 and leaves that turbine 50 at a second intermediate temperature …
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 November 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2014.
- 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.