Patent ID: 8850369

Claim:
A method of manufacturing an IC device comprising: receiving an IC device precursor; forming a dielectric layer on the IC device precursor; forming a first and second hard mask layer on the dielectric layer, wherein the first hard mask layer is formed above the second hard mask layer; patterning the first hard mask layer using a first mask to form a first pattern on the first hard mask layer; patterning the second hard mask layer using the first pattern of the first hard mask layer and a second mask that is different from the first mask to form a second mask pattern that defines a first set of conductive features; patterning the first hard mask layer using a third mask that is different from both the first mask and the second mask to form a third pattern on the first hard mask layer; transferring the third mask pattern to the second hard mask layer from the first hard mask layer to define a second set of conductive features; etching the dielectric layer using the second hard mask layer having the second mask pattern and the third mask pattern formed thereupon; and depositing a conductive material to form the first and second sets of conductive features.