Patent ID: 7617757

Claim:
A ballistic structure for providing protection against a projectile comprising: a single monolithic ceramic plate having a convex strike-face and a concave nonstrike-face; and a first group of slits having a slit width less than or equal to about 1/10 the thickness of the single monolithic ceramic plate, a slit depth penetrating all the way through the single monolithic ceramic plate, and a slit length; wherein the first group of slits are arranged in a first pattern forming a two-dimensional grid of polygons etched in the convex strike-face of the single monolithic ceramic plate; wherein each ballistic segment is represented on the convex strike-face of the single monolithic ceramic plate by a polygon from the first pattern; wherein each polygon from the first pattern is bound by a series of straight lines and vertices such that the endpoints associated with each straight line do not intersect with the endpoints associated with adjacent straight lines, thereby keeping the boundary around each polygon from the first pattern open at each vertex; wherein adjacent polygons from the first pattern share one or more vertices; wherein each straight line of each polygon from the first pattern comprises one or more slits from the first group of slits; and wherein the first pattern divides the single monolithic ceramic plate into multiple ballistic segments for limiting projectile-induced cracks from propagating from one ballistic segment to a neighboring ballistic segment, thereby providing protection against a second projectile.