Security label laminate and method of labeling
First Claim
1. A method for labeling products and product packages with invisible information, comprising the steps of:
- providing a label laminate that includes a layer of light transmissive sheet material with a light transmissive layer of adhesive;
providing an amount of invisible marker to one of said sheet material and said adhesive that contains invisible information that is detectable by light having a selected wavelength;
wherein the amount of marker selected is sufficient to allow information in the marker to be detected only when the laminate is affixed over a surface that provides a selected, non-interfering optical background;
detachably affixing said laminate over a first surface;
removing said laminate from said first surface;
placing said laminate over a second surface having said selected optical background;
exposing said marker with light having said selected wavelength; and
detecting said invisible information.
21 Assignments
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Accused Products
Abstract
A labeling method for marking a product with invisible information. The label includes a removable laminate formed from a light transmissive layer, and a light transmissive adhesive that detachably affixes the label to a product. The label includes an invisible marker that contains information, detectable by light of selected wavelength. The amount of marker selected is sufficient to allow information in the marker to be detected only when the laminate is affixed over a surface with a selected optical background. The label laminate is removed from the surface of the product and affixed to a surface having the selected optical background and is exposed to light that renders the information in the marker detectable. The method allows covert information in the label laminate to be reliably detected and read with the use of minimal quantities of marker material.
62 Citations
11 Claims
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1. A method for labeling products and product packages with invisible information, comprising the steps of:
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providing a label laminate that includes a layer of light transmissive sheet material with a light transmissive layer of adhesive; providing an amount of invisible marker to one of said sheet material and said adhesive that contains invisible information that is detectable by light having a selected wavelength; wherein the amount of marker selected is sufficient to allow information in the marker to be detected only when the laminate is affixed over a surface that provides a selected, non-interfering optical background; detachably affixing said laminate over a first surface; removing said laminate from said first surface; placing said laminate over a second surface having said selected optical background; exposing said marker with light having said selected wavelength; and detecting said invisible information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification