Data carrier having an optical authenticity feature and methods

Details Data carrier having an optical authenticity feature and methods Data carrier having an optical authenticity feature and methods

1986-10-15

1988-08-23

Bell, Paul A.

Printed matter

Method

Identifying

283 91, 283904, B42D 1500

Patent

active

047656565

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.

REFERENCES:
patent: 4250393 (1981-02-01), Greenaway
patent: 4417784 (1983-11-01), Knop et al.
patent: 4632430 (1986-12-01), Wicker

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