0621056-A1 is referenced by 18 patents and cites 5 patents.

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 (45), the second end (96) of the breathing hose being connected to a facepiece (100), the powered filtering device further comprising means (110); for controlling the pump means provided at or near the outlet of the housing for controlling air flow between the inlet(s) and the outlet(s) in response to a wearers breathing pattern.

Title
Respiratory protective device.
Application Number
EP19940302549 19940411
Publication Number
0621056 (A1)
Application Date
April 11, 1994
Publication Date
October 26, 1994
Inventor
Stickland Matthew Thomas
GB
Grant Andrew Douglas
GB
Deacon Alastair Mcdonald
GB
Wilkie Jacqueline
GB
Govan Kenneth Mcintosh
GB
Blackwood Thomas
GB
Assignee
Msa Britain
GB
IPC
A62B 18/00
A62B 18/00
A62B 18/00
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