Production of argon from a cryogenic air separation process
CA 2273705 C · Owner: Air Products And Chemicals, Inc. · Inventors: Agrawal, Rakesh; Herron, Donn Michael; Cook, Stephen John
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 cryogenic separation of air to, recover at least a nitrogen-depleted crude argon product wherein the process , is carried, out in a primary distillation system comprising at least a first distillation column, which, separates a feed mixture comprising nitrogen oxygen and argon into a , nitrogen-enriched overhead and an oxygen-rich bottoms and a side-arm column , which rectifies an argon-containing feed stream fed from the primary distillation column to produce an, essentially-oxygen-depleted argon overhead. The improvement of the present invention, is characterized in that: (a) a nitrogen-containing argon-rich side stream is , …
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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 June 3, 1999 and granted May 22, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 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
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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.