Breathing apparatus
CA 1104457 A · Owner: Breathing Systems, Inc. · Inventors: Henneman, John W.; Flood, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A portable breathing apparatus for use in a noxious atmosphere includes a helmet that is closed except for a bottom opening that is provided with a neck seal to permit the helmet to be slipped over the head of the wearer while sealing the open bottom of the helmet to provide an airtight enclosure about the wearer's head. A backpack includes a high pressure oxygen cylinder, that is connected to a regulator valve through a pressure reducer; and a carbon dioxide scrubber that receives expiration, gas from the helmet through an exhaust breathing line which connects to a flexible reservoir which collects the majority of expired gases and which is provided with a relief …
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
- Granted July 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 1998.
- 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.