Patent ID: 8449805

Claim:
A method comprising: defining an initial pattern of features over a partially-formed imprint reticle; performing a first pitch multiplication process to form a first pattern of lines from the initial pattern of features, wherein performing the first pitch multiplication process comprises: forming a first set of spacers at sidewalls of features of the initial pattern of features, the first set of spacers constituting the first pattern of lines; performing a second pitch multiplication process to form a second pattern of lines over the first pattern of lines, wherein the first and the second patterns of lines form an altered pattern of features, wherein the second pattern of lines cross the first pattern of lines, wherein performing the second pitch multiplication process comprises: providing a plurality of placeholder features on a level over the first pattern of lines; and forming a second set of spacers at sidewalls of the placeholder features, the second set of spacers constituting the second pattern of lines; and transferring at least part of the altered pattern of features into the partially-formed imprint reticle to define an array of isolated features.