Pipettes

Details Pipettes Pipettes

1978-04-10

1979-08-21

Swisher, S. Clement

Measuring and testing

Measuring vessel

B01L 302

Patent

active

041648706

ABSTRACT:
A fixed stroke pipette having a measuring piston that controls the volume of liquid aspirated into the pipette reservoir and a larger piston that assures the expulsion of all the aspirated liquid during a discharge stroke. An improved piston arrangement provides a fixed seal for the air chamber in which the measuring piston moves and a separate air passageway to that air chamber, controlled by a spring biased check valve, through which compressed air is delivered to the pipette reservoir during a discharge stroke.

REFERENCES:
patent: 3834590 (1974-09-01), Robinson et al.
patent: 3933048 (1976-01-01), Scordato
patent: 3935734 (1976-02-01), Keegan

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