Liquid dispensing system including a discharge assembly providing a positive air flow condition
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United States of America Patent
Stats
-
Jan 21, 1992
Grant Date -
N/A
app pub date -
May 1, 1990
filing date -
May 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A liquid dispenser having a replaceable unvented liquid container with only an outlet opening, a discharge assembly in liquid communication with the liquid container outlet opening, and including a compressible nipple for accommodating a charge of liquid, a check valve for regulating the flow of liquid into the nipple and a semipermeable filter mounted in and substantially filling the inlet to the check valve, the filter element being permeable to air to introduce air into the liquid container through its outlet opening, the filter element being impermeable to liquid to prevent back flow of liquid through the air passageway, and having an opening therethrough which is aligned with the inlet of the check valve, defining a liquid passageway through the filter element to the check valve.
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