Patent ID: 7452584

Claim:
A composite structure, comprising: a first substrate having a first front face that ends at a first outline and a first chamfered face that begins at the first outline and is peripherally positioned about the first front face; and a second substrate having a second front face that ends at a second outline of dimensions larger than the first outline; wherein the first and second front faces are molecularly bonded to each other with the first outline disposed at least partially within the second outline in an area of overlap, such that a peripheral ring extending around the first front face within the area of overlap in which bonding between the front faces is weak or absent has a maximum width of less than 0.5 mm; and wherein the first substrate includes a further chamfered face peripherally positioned about the first chamfered face and the second substrate includes a further chamfered face peripherally positioned about the second front face wherein the further chamfered faces do not contact each other.