Liquid dispenser with coaxial piston and rod for dispensing a pr

Details Liquid dispenser with coaxial piston and rod for dispensing a pr Liquid dispenser with coaxial piston and rod for dispensing a pr

1998-03-13

1999-12-07

Kaufman, Joseph A.

Dispensing

With discharge assistant

With discharge volume varying means

222333, 222386, G01F 1100

Patent

active

059968540

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.

REFERENCES:
patent: 4101283 (1978-07-01), Sundstrom
patent: 4228924 (1980-10-01), Gilbert
patent: 5022556 (1991-06-01), Dency et al.
patent: 5035270 (1991-07-01), Herzog
patent: 5067531 (1991-11-01), Herzog
patent: 5348585 (1994-09-01), Weston
patent: 5467899 (1995-11-01), Miller

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