Boiling liquefied gas
CA 2048254 A1 · Owner: Lavin, John T. · Inventors: Lavin, John T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a double rectification column 2 for separating air liquid oxygen from, a lower pressure rectification column 6 is collected in a tank 25 and flows out of the tank 25 under gravity and passes downwardly through a heat exchanger or condenser-reboiler 16 in which falling films of the liquid oxygen are reboiled by heat exchange with condensing nitrogen vapour from a higher pressure rectification column 4. Unboiled liquid oxygen flows out of the bottom condenser-reboiler 16 and falls into a volume 66 of liquid oxygen in a sump 68 of the lower pressure rectification column 6. Heat exchangers 70 and 72 are partially immersed in the volume 66 of liquid oxygen and boil thermosiphoning liquid …
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 July 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2013.
- 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.