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Patent Searching and Data


Title:
UNIDIRECTIONAL VALVES AND FILTERING FACE MASKS COMPRISING UNIDIRECTIONAL VALVES
Document Type and Number:
WIPO Patent Application WO/2011/084290
Kind Code:
A3
Abstract:
A unidirectional valve for use with a filtering face mask. The valve can include a flap, and a valve seat. The flap can be cantilevered and can flex away from a seal surface of the valve seat to an open position. The valve can further include a housing that at least partially covers the valve seat and the flap. In some embodiments, the height of the housing is no greater than about 1.25 cm, while the distance between the flap and the seal surface when the flap is in the open position is at least 0.35 cm. A projection can be coupled to an inner surface of the housing, and the height of the projection can generally decrease toward the front of the housing. In some embodiments, the projection can have a profile that substantially follows the profile of the flap when the flap is in the open position.

Inventors:
XUE THOMAS J (US)
DOMROESE MICHAEL K (US)
MARTIN PHILIP G (US)
ABEL NATHAN A (US)
Application Number:
US2010/059024
Publication Date:
July 14, 2011
Filing Date:
December 06, 2010
Export Citation:
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Assignee:
3M INNOVATIVE PROPERTIES COMPANY (3M Center, Post Office Box 33427Saint Paul, Minnesota, 55133-3427, US)
International Classes:
A62B9/02; A62B7/04; A62B18/02
Foreign References:
US20030005934A12003-01-09
EP0756881A21997-02-05
US4915105A1990-04-10
US5465712A1995-11-14
US5127397A1992-07-07
US4898174A1990-02-06
Attorney, Agent or Firm:
EINERSON, Nicole, J. et al. (3M Center, Office of Intellectual Property CounselPost Office Box 3342, Saint Paul Minnesota, 55133-3427, US)
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