Credit and identification cards having pieces of diffraction grating therein
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 15, 1985
Grant Date -
N/A
app pub date -
Nov 10, 1983
filing date -
Nov 10, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An information bearing credit or identification card in which pieces of a diffraction grating, preferably an embossed hologram, are randomly distributed in a plastic or paper card so that light reflecting therefrom uniquely and visually differentiates the grating and hence the card. The pieces may be mixed in the plastic pig or with the paper prior to rolling or sprinkled in the plastic or other substrate during rolling.
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