Erasable optical wallet-size data card
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United States of America Patent
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Aug 31, 1993
Issued Date -
N/A
app pub date -
Mar 3, 1989
filing date -
Feb 27, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An erasable optical, wallet-size data card utilizing an erasable recording strip in which laser written data is recorded. The data card also contains permanently stored prerecorded information in the form of surface contours or photographic marks. The prerecorded information is stored either atop of or directly below the erasable recording strip either in a transparent protective layer, a polymer underlayer or a plastic card base. Both sets of data, the laser written and the prerecorded, may be read and viewed simultaneously without interfering with each other. The erasable material used in the erasable recording strip may be magnetooptical material, amorphous-crystalline material or liquid crystal material or material showing a metal-insulator transition.
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