Patent ID: 9493025
Filing Date: 2016-11-15
CPC Classification: B42D,G01J,G01N

Claim Text:
1. A method of manufacturing a multilayered security device, comprising: creating a substrate layer; transferring a first layer of graphene sheet onto the substrate layer such that the first layer of graphene sheet forms an exposed substrate area on the substrate layer and a different contrasting pattern with the exposed substrate area when exposed to a verification stimulus, the first layer of graphene sheet is created by a process that creates a monolayer of covalently-bonded carbon atoms in a continuous sheet, the different contrasting pattern having a first contrast against the substrate layer; transferring a second layer of graphene sheet onto the substrate layer such that the second layer of graphene sheet overlaps a subsection of the first layer of graphene sheet, the second layer of graphene sheet overlapping the first layer of graphene sheet forms a second different contrasting pattern with the exposed substrate area when exposed to a verification stimulus, the second different contrasting pattern having a second contrast against the substrate layer that is greater than the first contrast; applying a protective coat to the layers of graphene sheet and the exposed substrate area; and removing a portion of the substrate layer.