Rebreather system with depth dependent flow control and optimal po2 determination
CA 2296338 A1 · Owner: Lewis, John E. · Inventors: Lewis, John E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a method and apparatus for a self-contained underwater breathing apparatus (100) in which a breathing gas is supplied to a flow loop (104) from two separate gas sources (110 112) each having a , different oxygen fraction and each controlled by separate mass flow controllers (120, 122) having variable flow rates. The mass controller flow rates are adaptively adjustable to deliver gas at variable flow rates which depend solely on a function of depth.
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 16, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 2020.
- 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.