Liquid dispenser with coaxial piston and rod for dispensing a precise volume
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United States of America Patent
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-
Dec 7, 1999
Grant Date -
N/A
app pub date -
Mar 13, 1998
filing date -
Feb 13, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A liquid dispensing device for use in the dispensing of micro-volumes of liquid for gas chromatography has a cylinder with an open end and has a piston slidable therein. The piston has a coaxial rod slidable within itself; and displacement member including a reversible stepper motor and clutch mechanism is provided to effect selectable linear displacement of the piston in the cylinder and/or the rod in the piston in order to vary to volume of the cylinder, the top end of which is in communication with the fluid sample to be injected.
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