Pipette controller with graduate reading plunger and lever assem

Measuring and testing – Sampler – sample handling – etc. – Capture device

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7386418, B01L 302

Patent

active

042941253

ABSTRACT:
A pipette controller comprising a coil spring arranged in a cylinder between the bottom of the cylinder and the piston for biasing said piston to a predetermined position in which a graduate reading plunger in thread engagement with a threaded rod mounted on a piston projects through a hole in the top of a cylinder cap, and a double-sealing means adapted to be engaged with a port formed on the bottom of the cylinder for sealing the end of a pipette to the controller with the interior of the pipette in communication with the chamber defined by the piston and cylinder.
A lever assembly is provided which vents the interior of the cylinder to facilitate gravity drainage of the pipette. Both the plunger and the lever assembly can be operated easily with one hand.

REFERENCES:
patent: 2172575 (1939-09-01), Caufield
patent: 3302462 (1967-02-01), Pursell
patent: 3809297 (1974-05-01), Poulten
patent: 4016765 (1977-04-01), Lee
patent: 4133211 (1979-01-01), Sarstedt

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