Patent ID: 8512518

Claim:
A security paper for a document, the security paper comprising: a base comprising a first plurality of fibers; the base comprising a windowed area and a non-windowed area; a security thread or strip embedded in the base, the security thread or strip being visible in the windowed area, the security thread or strip being covered in the non-windowed area with a second plurality of fibers, the second plurality of fibers in the non-windowed area forming a bridge over the security thread or strip; and an electrotype watermark disposed in the non-windowed area and being adjacent to the security thread or strip without interference between the electrotype watermark and the security thread or strip and without overlapping the security thread or strip; wherein the first plurality of fibers and the second plurality of fibers comprise identical fibers, the second plurality of fibers having more fibers than the first plurality of fibers; wherein the bridge has more opacity than the base and the windowed area has less opacity than the base.