Respiratory protective device
CA 2121157 C · Owner: Govan, Kenneth Mckintosh · Inventors: Wilkie, Jacqueline; Deacon, Alistair Macdonald; Stickland, Matthew Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a respiratory protective device and a related powered filtering device. Known devices suffer from a number of problems, such as liability to failure, overworking and lack of fault indication. Accordingly one aspect of the present invention provides a respiratory protective device (5) providing a powered filtering device (10) comprising a housing (15) having at least one inlet (20) and an outlet (25) pump means (35), being provided between the at least one inlet and the outlet for pumping air therebetween, a filter(s) being provided in association with the inlet(s) and/or outlet the outlet being connected to a first end (94) of a breathing hose (95) , the second end (96) …
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 April 13, 1994 and granted January 6, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 13, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 13, 2016.
- 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.