Unidirectional respirator valve

Details Unidirectional respirator valve Unidirectional respirator valve

2005-04-26

2005-04-26

Bennett, Henry (Department: 3743)

Surgery

Respiratory method or device

Means for removing substance from respiratory gas

C128S205240, C128S206210, C128S205250

Reexamination Certificate

active

06883518

ABSTRACT:
A unidirectional valve, wherein the valve comprises a valve body including a frame, a valve opening through the frame, and a valve seat extending from the frame and at least partially surrounding the valve opening. The valve further includes a valve flap having a first portion attached to the frame and an adjacent second portion free to move from a first position where the second portion is in contact with at least a part of the valve seat to a second position where at least part of the second portion is spaced from the valve seat, wherein the valve flap has a nonuniform thickness. The thickness variations may occur between sides of the valve flap, and may also occur between the ends of the valve flap.

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7700 Series Half Mask Respirators, Pro—Am, 2000, available at http://www.pro—am.com/CAtalog/Exec/product.asp?product_id=64.

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