Access card
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United States of America Patent
Stats
-
Sep 15, 1987
Grant Date -
N/A
app pub date -
Jul 5, 1985
filing date -
Feb 7, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an access card having coded material which comprises a plurality of markings which under infrared radiation appear on an infrared receiver, it is provided in accordance with the invention in order to prevent counterfeiting that a continuous and transparent plastic foil or film blank (4), at least on a portion of its surface, has a layer (4a) that is not transparent to visible light and is transparent to infrared light; together with a substrate (5), the blank embodies a laminate which on its inside carries a photosensitive layer (7) covered by a layer that is transparent to infrared light. The markings (21-23) appear as a negative or positive on the photosensitive layer (7) as the result of exposure of the plastic foil or film blank (4) to light.
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Cited Art Landscape
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