Cryogenic process for the production of an oxygen-free and methane-free, krypton/xenon product
CA 2060221 A1 · Owner: Wilson, Keith Bateman · Inventors: Wilson, Keith Bateman; Agrawal, Rakesh; Farrell, Brian Eugene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the production of kryton and xenon by using an oxygen-free vapor stream to strip a liquid stream containing oxygen, krypton, methane and xenon of methane and, oxygen. This is accomplished by properly controlling the liquid to vapor flow ratio in the distillation column so that such ratio is less than 0.15. A suitable reflux liquid is used to decrease the loss of krypton and xenon in the methane and oxygen laden vapor stream leaving the distillation system.
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 January 29, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 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.