Patent ID: 6189934
Filing Date: 2001-02-20
Classification: B41M,Y10S

Abstract:
An anti-copy layer for documents which, while essentially transparent under diffuse light conditions, prevents production of true-copies by light dependent copying apparatus, comprising;a multiplicity of small fragments of a crystalline material of a predetermined size, with spectral characteristics, embedded within a substantially transparent coating,wherein said fragments have spectral characteristics of transmitting, reflecting, and refracting light striking said fragments, according to angle of incidence,wherein multi-angular illumination of a spectral fragment visually results in more reflection and refraction of light than in transmission, thereby visually obscuring underlying information,wherein said coating is comprised of, but not limited to, lacquer, water-based polymers, polyester resins, wherein a multiplicity of fragments situated within said coating upon a document, when illuminated in a copying apparatus, generate a sufficient amount of visual noise and undesirable artifacts in copies as to render said copies inferior in quality, value, or utility compared to said document,wherein said coating and spectral fragments can be formulated and adapted for application utilizing traditional and digital printing and coating methodologies, including packaging in spray cans for usage by individuals.