Erasable optical wallet-size data card
US5241165A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1989 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Mar 3, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/34
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.