Liquid dispensing systems and methods
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United States of America Patent
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Nov 27, 2001
Grant Date -
N/A
app pub date -
Jul 24, 1999
filing date -
Jul 24, 1999
priority date (Note) -
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Abstract
The present invention provides systems and methods of dispensing liquids. In one embodiment, the system includes a pump with a removable pump module with at least one displacement piston and at least one piston valve. A motor and base assembly provide the supporting components of the pump which can be used in environments where precise small volumes of ultra-pure liquids must be transferred from a reservoir to a point of use. The preferred embodiment of the system prevents contaminants and air bubbles from being introduced into the liquid to be dispensed by placing a filter across the discharge line downstream from the pump, and providing a separate drawback line for performing the drawback of the liquid in the dispensing nozzle.
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