Dispenser pumps
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United States of America Patent
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Mar 10, 2009
Issued Date -
N/A
app pub date -
Sep 27, 2002
filing date -
Oct 1, 2001
priority date (Note) -
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Abstract
A pump dispenser suitable for dispensing toothpaste in which a pump chamber has a resiliently flexible flap outlet valve leading into a discharge passage leading to a discharge nozzle. The discharge nozzle features a closure valve, in the form of a concave wall with radial slits, which opens only under appreciable forward pressure. When released, the closure valve closes and retracts forcibly, giving a clean cut-off of product and a degree of backflow via the large outlet valve area of the flap valve as it closes.
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