Patent US3724035A successfully refreshed from Google Patents.
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EP0481388A2
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EP
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Data storage medium in form of card with several layers and method for the production
Assignee: GAO Gesellschaft fuer Automation und Organisation mbH
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Filing: 1991-10-14
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Granted: —
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Expires: 2011-10-14
Abstract
Abstract In a multi-layer card-shaped data storage medium having a layer which appears black in the visible wavelength range but is transparent to test rays in the invisible wavelength range, markings masked by the layer appearing black are provided which are generated by means of a laser beam writer in or underneath the black layer. <IMAGE>
Inventors
- 👤 Erwin Lob
- 👤 Hansjürgen Merkle
- 👤 Alexander Hierweger
- 👤 Wolfgang Killar
- 👤 Wittich Dr. Kaule
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:29
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/14; B; B42; B42D; B42D25/00; B42D25/30; B42D25/36; B42D25/378; B42D25/382; B42D25/387; B42D25/40; B42D25/405; B42D25/41; B41; B41M; B41M5/00; B41M5/26; B41M5/267; B42D2033/20
Claims Analysis
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