Patent ID: 7265436
Filing Date: 2007-09-04
Classification: H01L

Abstract:
1. A seal ring structure comprising: a substrate; a plurality of layers of metal lines formed overlying said substrate; and a plurality of metal vias through intermetal dielectric layers between said layers of metal lines; wherein said metal vias interconnect said metal lines; wherein said plurality of layers of interconnected metal lines forms a continuous seal ring around a die, said seal ring having a plurality of edge portions and a plurality of corner portions, each said edge portion extending between a respective pair of said corner portions, each said corner portion of said seal ring having approximately straight first and second edges on inner and outer sides thereof that are approximately parallel to each other, and that are sloped at an angle to each of two said edge portions located adjacent that corner portion, so each said corner portion is free of a sharp corner; and wherein a first width of said metal lines between said first and second edges of each said corner portion is wider than a second width of said metal lines at each said edge portion.