Pipets containing electrolyte and electrodes
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United States of America Patent
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Apr 19, 2016
Grant Date -
Jun 6, 2013
app pub date -
Aug 11, 2011
filing date -
Aug 11, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus comprises a pipet comprising first and second channels separated by a septum and having a tip at which each of the first and second channels is open; an electrolyte solution contained within both the first and second channels of the pipet; a first electrode extending into the electrolyte in the first channel of the pipet; a second electrode extending into the electrolyte in the second channel of the pipet; means for applying a potential difference between the first and second electrodes; means for measuring alternating current components of a current flowing to or from the first electrode; means for applying an oscillatory perturbation to the pipet; and means responsive to the alternating current measured to be flowing to or from the first electrode to adjust a position of the pipet such as to control a separation between the tip of the pipet and a surface of interest.
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