Double-plunger liquid displacement syringe pipet

Details Double-plunger liquid displacement syringe pipet Double-plunger liquid displacement syringe pipet

1993-11-15

1995-10-03

Williams, Hezron E.

Measuring and testing

Sampler, sample handling, etc.

Capture device

7386413, 422100, G01N 114

Patent

active

054542685

ABSTRACT:
A device is described which measures and dispenses accurate and reproducible volumes of normal, viscous, or low density organic liquid. The device consists of a rigid cylindrical tube containing a main coil spring which makes the core shaft move, a double-plunger attached on the low end of the core shaft, and a syringe barrel attached securely on the low end of the cylindrical tube. The coil spring is supported by the lower end plug through which the core shaft moves. This double-plunger system should measure liquid volumes accurately without air space between the liquid and the plunger, and deliver completely without leaving any residual liquid in the syringe barrel.

REFERENCES:
patent: 4023716 (1977-05-01), Shapiro
patent: 4036064 (1977-07-01), Hydo
patent: 4333458 (1982-06-01), Margulies et al.
patent: 4672857 (1987-06-01), MacDermott

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