Patent ID: 6033544
Filing Date: 2000-03-07
Classification: B01F,B01J,B01L

Abstract:
A system for selectively distributing liquid from two or more liquid sources to a plurality of cells, the system comprising:(A) liquid sources;(B) a substrate comprising a network of fluid channels of capillary dimensions for directing liquid from the liquid sources to a plurality of outlets for outputting liquid at the cells;(C) pumps, that move liquid with electrodes, for each outlet, wherein the electrodes are incorporated into the substrate, the pumps for selectively pumping liquid from a liquid source and out of one of the outlets;(D) capillary barriers interposed in the channels, each comprising an opening into a chamber, each capillary barrier for inhibiting the flow of liquid out a given outlet; and(E) at least one gas reset mechanism comprising a network of channels having inlets into the chambers operable to inject gas in the chambers and thereby remove liquid from the chambers and improve the operation of the capillary barriers;wherein the pumps can be selectively operated, and at least one said cell can receive liquid from either a first liquid source or another liquid source depending on the operation of the pumps.