Single stage secondary high purity oxygen concentrator
CA 2198527 C · Owner: Cramer, Robert Louis · Inventors: Cramer, Robert Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A single stage secondary high purity oxygen concentrator and method of concentrating oxygen are described. The concentrator has at least a first and a second inlet valve, a first and a second molecular sieve bed and a first and a second outlet, valve. According to a first embodiment of the present invention the concentrator, further comprises a relief valve. During a charge cycle of the first molecular sieve bed the first inlet valve is open, the first outlet valve is closed the second inlet valve is, closed, and the second outlet valve is open such that adsorbed oxygen of the second molecular sieve bed is desorbed or withdrawn while the first molecular sieve bed is charging. Similarly, …
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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, 1997 and granted August 13, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2019.
- 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.