Data carrier having an optical authenticity feature and methods for producing and testing said data carrier
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 23, 1988
Grant Date -
N/A
app pub date -
Oct 15, 1986
filing date -
Oct 15, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a data carrier (identification card, bank card, credit card, etc.) in which information is provided in an inner volume area by means of a laser beam, the information being visible in the form of changes in the optical properties of the carrier material due to an irreversible change in the material caused by the laser beam and to a method for producing the data carrier and for testing it.
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