Patent ID: 6967111

Claim:
A method for forming die on wafers, the method comprising: forming a first die on a first wafer, the first die having a first test structure on a first side of the first die and a first die area that includes a first primary die, the first test structure being separated from the first die area by a first gap; and forming a second die on the first wafer next to the first side of the first die, the second die having a second test structure on a first side of the second die and a second die area that includes a second primary die, the second test structure being formed in the first gap between the first die area and the first test structure, wherein the first die and the second die are formed using a reticle, and the method further comprises: forming a third die on a second wafer using the reticle, wherein a blade blocks imaging radiation from passing through a portion of the reticle that formed the first test structure; and forming a fourth die next to the third die on the second wafer using the reticle, wherein the blade blocks imaging radiation from passing through a portion of the reticle that formed the second test structure.