Face mask that has a filtered exhalation valve
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United States of America Patent
Stats
-
Jul 1, 2003
Grant Date -
Feb 28, 2002
app pub date -
Jul 24, 1998
filing date -
Jul 24, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filtering face mask that covers at least the nose and mouth of a wearer and that includes an exhalation valve. The exhalation valve opens in response to increased pressure when the wearer exhales to allow the exhaled air to be rapidly purged from the mask interior. An exhale filter element is placed in one of several locations in the exhale flow stream to remove contaminants from the exhaled air. The face mask is beneficial in that it provides comfort to the wearer by allowing warm, moist, high-CO.sub.2 -content air to be rapidly evacuated from the mask interior through the valve and also protects the wearer from splash fluids and polluted air while at the same time protecting other persons or things from being exposed to contaminants in the exhale flow stream.
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