Document with an unforgeable surface
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 29, 1991
Grant Date -
N/A
app pub date -
Nov 25, 1988
filing date -
Dec 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Documents and data, patterns, etc., applied thereto, which are present in the form of a surface relief, in particular in the form of embossed characters, are provided partially in the area of this surface relief with luminescent substance which is testable visibly and by machine. The luminescent substance is introduced either into raised or into depressed areas of the surface relief, so that characteristic features of the surface relief are reflected in its spatial distribution. The data can thus be tested for falsification and at the same time for authenticity in a simple way.
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Cited Art Landscape
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