Patent ID: 8304150

Claim:
A method for building microstructures, comprising the steps of: (a) forming a patterned dielectric mask on a substrate, having a mask thickness equal to or larger than a desired height of a microstructure to be formed, and relief features formed into the mask; (b) applying a first spatial electrical charge to the patterned dielectric mask, to thereby form a first spatial charge pattern; (c) developing the first spatial charge pattern with an electrically charged first functional toner in a liquid; (d) applying a second spatial electrical charge to the patterned dielectric mask, to thereby form a second spatial charge pattern; (e) developing the second spatial charge pattern with an electrically charged first functional toner in a liquid, superposed on the developed first functional toner; and (f) processing the first and second functional toner material to form useful microstructures corresponding to the relief features of the patterned dielectric mask, wherein a composition of the microstructures varies in dependence on the first and second spatial charge distributions.