Patents Represented by Attorney Thos. Schneck

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  • Acoustic impedance system for pipette tip detection
    Patent number: 4846003
    Abstract: A measuring system for use with automated pipettes for determining the presence or absence of a pipette tip. The central conduit of the pipette is connected to a source of pressure waves, such as a speaker and also connected to a pressure wave detector, such as a microphone. Changes in acoustic impedance between an open conduit when no tip is present, a partially constricted conduit when a tip is present, and a closed conduit when the liquid boundary layer is contacted determine the measured states of the apparatus.
    Type: Grant
    Filed: June 8, 1988
    Date of Patent: July 11, 1989
    Assignee: Beckman Instruments, Inc.
    Inventor: Samuel A. Marquiss