Magnetic cards having a layer being permanently magnetized in a fixed configuration
US5949050A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1997 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Jan 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F9/375
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Magnetic cards are formed by plural, coadjoining, generally planar, parallel layers. Outermost layers form outer sides of each card. At least a first visible image is provided on a first of the outer sides. The card includes a generally planar, permanently magnetized layer formed by one or more permanently magnetizable planar components that are fixedly positioned preferably within a frame between the opaque outer sides or a magnetizable material layer only -part of which has been selectively permanently magnetized. The permanently magnetized layer or permanently magnetized portion of a larger, magnetizable layer has a predetermined configuration which is related at least in informational content to the first visible image. A silhouette of the predetermined configuration can be magnetically reproduced by placing a card on a magnetically actuated fluid display panel. The permanently magnetized component(s) or magnetized portion(s) of the permanently magnetizable layer generates an image on the panel which has a silhouette identical in configuration to that of the permanently magnetized component(s) or portion(s). Two magnetic layers and two images on opposite outer sides of each car…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.