Air separation
CA 2004368 A1 · Owner: Eaglen, Martin P. · Inventors: Eaglen, Martin P.; Owen, Robert; Oakey, John D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Air Separation, A gaseous feed of oxygen containing both light and heavy impurities is introduced through inlet 50 into a first liquid-vapour contact column 10 thereby producing a first fraction having an enhanced concentration of heavy impurities and a second fraction having a reduced concentration of heavy impurities. A gaseous first stream of the second fraction is condensed in a condenser 54 and returned to the column 10 as reflux through inlet 56. A second stream of the second fraction is fed into a second liquid-vapour contact column 12 having a reboiler 64 in which light impurities are stripped from the feed by ascending vapour. The second stream is introduced into the column 12 at a …
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 December 1, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2011.
- 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.