Title: Pipettes

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.

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Inventors: Scordato, Emil A. (Bronxville, NY, US)
Pratt, Hugh W. (Pelham Manor, NY, US)

Application Number: 895127
Filing Date: 1978-04-10
Publication_date: 1979-08-21
Assignee: Medical Laboratory Automation, Inc. (Mount Vernon, NY)
Primary Class(es): 73/864.17 73/864.18, 422/927
Other Classes:
US Patent Ref:

3834590	Sep, 1974	Robinson et al.	73/425.
3933048	Jan, 1976	Scordato	73/425.
3935734	Feb, 1976	Keegan	73/425.

Other Refs:
Primary Examiner: Swisher, S. Clement
Assistant Examiner:
Attorney: Keegan; William P.