Patent ID: 7494715

Claim:
A steel plate reinforcing sheet in order to be bonded to a steel plate; wherein the steel plate reinforcing sheet features a generally rectangular shape, as defined by a length and a width, and two end portions on either side of an imaginary line which bisects the length of the steel plate reinforcing sheet; wherein the steel plate reinforcing sheet is a laminate comprising a restricting layer and a reinforcing layer; wherein the restricting layer comprises at least two slits; wherein each end portion of the restricting layer comprises at least one slit; wherein each slit extends directly or indirectly across the entire width of the steel plate reinforcing sheet; and wherein the two slits closest to the imaginary line define a minimum distance between slits, said minimum distance being parallel to the length of the steel plate reinforcing sheet and equivalent to 40% or more of the length of the steel plate reinforcing sheet.