Expiratory valve unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Jun 21, 2007
app pub date -
May 17, 2004
filing date -
May 16, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An expiratory valve unit comprises a body having a plurality of outlets and valve seats, and a rotary closure member having a plurality of blades each normally biassed against a respective seat to close the outlets and being rotatable relative to said body when under pressure from user exhalate impinging the blades to open the outlets.
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