Variable aperture venting for respiratory mask
CA 2387228 A1 · Owner: Bowman, Bruce R. · Inventors: Hansen, Gary L.; Bowman, Bruce R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A respiratory mask (200) having a variable flow venting is provided according to the invention, including a gas supply hose (209) a mask shell (206) , adapted to output a gas to a respiratory system of a person the mask shell , (206) adapted to be connected to the gas supply hose (209) and an exhaust gas , flow volume regulating device (220) which maintains a substantially constant gas flow volume out of the respiratory mask (200) independent of an internal gas pressure inside the respiratory mask (200).
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 October 10, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2022.
- 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.