Transparent overlay for protecting a document from tampering
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United States of America Patent
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-
Oct 29, 1991
Grant Date -
N/A
app pub date -
Sep 19, 1989
filing date -
Sep 19, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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 a polymeric image-receiving layer over 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. When the polymeric image-receiving layer is dye-receptive, it can be imaged by using a thermal printing head with a dye-donor element. A preferred polymeric image-receiving layer that is dye-receptive is chlorinated poly(vinylchloride).
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