Transparent tamper-indicating document overlay
First Claim
Patent Images
1. A transparent overlay by which a document can be protected from tapering said overlay comprising:
- (a) a transparent flexible cover sheet;
(b) a layer of hot-melt adhesive over one surface of said transparent cover sheet, which adhesive has a glass transition temperature of at least about -15°
C.; and
(c) an image formed on the exposed face of said hot-melt adhesive layer, which image is visible through said transparent cover sheet.
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Accused Products
Abstract
A transparent overlay that can protect a document from tampering has a transparent cover sheet, a layer of hot-melt adhesive over one surface of the transparent cover sheet, and an image formed on the exposed face of said hot-melt adhesive layer. The transparent cover sheet can be a simple thermoplastic film but preferably is retroreflective sheeting which can bear a pattern or legend that is noticeable only when viewed retroreflectively.
76 Citations
11 Claims
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1. A transparent overlay by which a document can be protected from tapering said overlay comprising:
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(a) a transparent flexible cover sheet; (b) a layer of hot-melt adhesive over one surface of said transparent cover sheet, which adhesive has a glass transition temperature of at least about -15°
C.; and(c) an image formed on the exposed face of said hot-melt adhesive layer, which image is visible through said transparent cover sheet. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A document having a transparent overlay comprising:
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(a) a transparent flexible cover sheet; (b) a layer of hot-melt adhesive over one surface of said transparent cover sheet, which adhesive has a glass transition temperature of at least about -15°
C.; and(c) an image formed on the exposed face of said hot-melt adhesive layer, which image is visible through said transparent cover sheet; said overlay being laminate to said document by said hot-melt adhesive. - View Dependent Claims (9, 10, 11)
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Specification