Patent ID: 6521187
Filing Date: 2003-02-18
Classification: B01J,B01L,C40B,G01F,G01N,Y10T

Abstract:
A system for aspirating and ejecting drops of a transfer liquid onto a site of a wafer, said system comprising:said wafer containing at least one said site, each said site being porous and having pores about 10 to about 10,000 times smaller than the diameter of the drops; an enclosed space for holding a system liquid, a dispensing tube communicating with said enclosed space, said tube having an outlet, said outlet facing said site, said outlet being separated from said site by a distance greater than the diameter of said drops; a means for supplying a system liquid into said tube and for withdrawing from said tube said system liquid to aspirate said transfer liquid into said tube; and constricting means constricting the volume of said tube so as to eject drops of said transfer liquid onto said site, said tube and said constricting means adapted to produce drops in the range of from about 5 to about 500 picoliters.