Breathing apparatus for respiratory protection
CA 2134069 A1 · Owner: Stewart, John Stewart Simpson · Inventors: Stewart, John Stewart Simpson; Richards, Brian John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Breathing apparatus to provide respiratory protection having an outer hood, an inner hood, a reservoir at positive pressure a, breathable gas source and a conveyance means with one way valves in an open circuit system.
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 September 10, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2014.
- 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.