Frasable optical wallet-size data card
US4810868A · kind A · utility
84Cited by
19References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Jul 13, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10584
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data card having an optical recording medium formed by an erasable layer atop a polymer layer with prerecorded indicia, all atop a card base. The polymer layer has surface contours which constitute prerecorded indicia. The erasable layer disposed over the polymer layer displays the prerecorded indicia for reading, together with information on the erasable strip. The erasable material may be magnetooptical material, amorphous-crystalline material or liquid crystal material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.