07493900 is referenced by 3 patents and cites 108 patents.

A filtering face mask that has a mask body and an exhalation valve. The mask body is adapted to fit over the nose and mouth of a wearer. The exhalation valve is attached to the mask body and includes a valve seat that comprises a seal surface, an orifice that is circumscribed by the seal surface, a flap-retaining surface, and a single flexible flap that has a fixed portion and a free portion and first and second opposing ends. The first end of the single flexible flap is associated with the fixed portion of the flap so as to remain at rest during an exhalation, and the second end is associated with the free portion of the flexible flap so as to be lifted away from the seal surface during an exhalation. The second end also is located below the first end when the filtering face mask is worn on a person. The flexible flap is positioned on the valve seat such that the flap is pressed towards the seal surface in an abutting relationship therewith when a fluid is not passing through the orifice. A valve cover is disposed over the valve seat and comprises a surface that mechanically holds the flexible flap against the flap-retaining surface.

Title
Fibrous filtration face mask having a new unidirectional fluid valve
Application Number
9/678580
Publication Number
7493900 (B1)
Application Date
October 3, 2000
Publication Date
February 24, 2009
Inventor
Anthony B Ferguson
Woodbury
MN, US
Harold J Seppala
St. Paul
MN, US
Vaughn B Grannis
Inver Grove Heights
MN, US
Daniel A Japuntich
St. Paul
MN, US
Agent
Karl G Hanson
Assignee
3M Innovative Properties Company
MN, US
IPC
A62B 18/08
A62B 18/02
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