Personal breathing filter

Details Personal breathing filter Personal breathing filter

2006-04-11

2006-04-11

Mitchell, Teena (Department: 3743)

Surgery

Respiratory method or device

Face mask covering a breathing passage

C128S207120, C128S206170, C128S859000

Reexamination Certificate

active

07025060

ABSTRACT:
A personal air filtration device has a cylindrical exhalation tube, with a one-way valve thereon. Concentric around the periphery of the exhalation tube and integrally connected to the exhalation tube rearward (proximate the user's mouth) of the one-way valve is a filter media housing. Filter media is contained between the housing and the tube. A plurality of perforations in the exhalation tube, rearward of the one way valve but forward from the housing connection ring, provide inhaled air ingress to the exhalation tube. Inhaled air forces the one-way valve closed, so that air is directed through the filter media, passes through the perforations and into the exhalation tube where the user can take in the cleansed air. The pressure of the exhaled air through the exhalation tube causes the one-way valve to open, so that exertion by the user is minimized.

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patent: 6550479 (2003-04-01), Duxbury

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