Magnetic card having thermal recording layer and arrangement of magnetic bars for recording security information
US5113062A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1990 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Dec 4, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/904
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic card wherein visible patterns are written. A magnetic recording layer is formed on a substrate, a sensitizing layer is formed on the magnetic recording layer, a metallic thin layer is formed on the sensitizing layer, a protective layer is formed on the metallic thin layer, an arrangement of magnetic bars is formed on the protective layer at one region of the magnetic card, and at least one information track is formed on the magnetic recording layer at the other region of the magnetic card. The metallic thin layer and the sensitizing layer are configured such that, upon the application of heat by a localized source, the heated portions of the metallic thin layer are dispersed into the sensitizing layer to produce the visible patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.