Powered air respirator and cartridge
CA 1189459 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Braun, David L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high efficiency rigid or semi-rigid air filter cartridge for use in the helmet of a powered air respirator comprising a lightweight, open-topped trough-, shaped frame having an entrance at one end for attachment to an air discharge port of a fan motor housing assembly filter media sealed about its periphery to close said frame, said frame and said filter media enclosing a contaminated air plenum bounded by the inside surfaces of the bottom and side walls of said frame and the under surface of said filter media, such that contaminated air from said air discharge port is channeled under pressure through said plenum and distributed under pressure to and through said filter media and provides …
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 June 25, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 25, 2002.
- 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.