Air displacement apparatus for use with a fluid transfer device

Details Air displacement apparatus for use with a fluid transfer device Air displacement apparatus for use with a fluid transfer device

2005-04-25

2009-10-13

Williams, Hezron (Department: 2856)

Measuring and testing

Sampler, sample handling, etc.

Capture device

Reexamination Certificate

active

07600440

ABSTRACT:
A liquid sealed air displacement apparatus may be used in a fluid transfer device to transfer volumes of fluid. The air displacement apparatus may include a piston and a cylinder defining a displacement chamber for receiving the piston. The air displacement apparatus may be used to displace precise volumes of air into the air displacement chamber. Displacing the air creates a negative pressure in the air displacement chamber (i.e., suction), which may cause a precise volume of fluid to be drawn into the fluid transfer device. The piston and the cylinder may define a diametrical clearance for receiving sealing fluid, which may prevent air leakage and wear.

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patent: 6254832 (2001-07-01), Rainin et al.
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patent: 815531 (1981-03-01), None
Haydon Switch & Instrument, Inc., 28000 Series Size 11 Captive Linear Actuator, 2003.

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