Patent ID: 6342735
Filing Date: 2002-01-29
Classification: G03F,H01L

Abstract:
A structure, comprising an alignment mark, the alignment mark having a first aspect and a second aspect different from said first aspect, said first aspect comprising a first feature extending in a first direction and a second feature extending in a second direction, said second aspect comprising a third feature extending in a third direction and a fourth feature extending in a fourth direction, wherein each said direction is different from each said other directions, wherein said third feature is superimposed on said first feature and said fourth feature is superimpiosed on said second feature wherein a first photolithography tool is capable of aligning to said first aspect and a second photolithography tool is capable of aligning to said second aspect, wherein said first photolithography tool is substantially insensitive to the presence of said second aspect and said second photolithography tool is substantially insensitive to the presence of said first aspect.