Method of recovering oxygen-rich gas
CA 2189232 C · Owner: Sumitomo Seika Chemicals Co. Ltd. · Inventors: Miyake, Masanori; Sasano, Hiroaki; Haruna, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of recovering an oxygen-rich gas from a gaseous mixture mainly comprising nitrogen and oxygen by pressure swing adsorption using two adsorption towers (A and B) packed with adsorbents adsorbing selectively nitrogen wherein the, recovery of the oxygen-rich gas remaining as the result of pressure equalization between the two towers is conducted exhaustively and nitrogen is continuously withdrawn by suction by connecting a vacuum pump to either tower (A) or tower (B) without interruption. To that end the pressure, equalization between the two towers (A and B) is conducted in at least two steps in such a manner that one tower (A or B) is increased in pressure, while the other tower (B …
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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 February 26, 1996 and granted July 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2018.
- 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.