Respirators
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United States of America Patent
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-
N/A
Issued Date -
Feb 14, 2008
app pub date -
Mar 17, 2005
filing date -
Mar 19, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An exhalation valve assembly for a respirator, said assembly comprising an upstream one-way flap valve and a downstream one-way flap valve, both mounted within a housing. The valves are 5 spaced apart to define therebetween a volume which acts as a `dead space` in which a portion of the just-exhaled air will rest so that, should the upstream valve leak for any reason, any leakage air drawn back into the respirator will be taken from this just-exhaled air, and will thus not be contaminated by the ambient air.
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