Card having a ferromagnetic track and reader therefor
US5557090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1995 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Mar 9, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10009
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A bank or identity type of magnetic card contains ferromagnetic elements that selectively absorb waves at microwave frequencies. The disclosure also relates to a reading device adapted to this card. The device has an active system and a resonant system capable of filtering the microwaves at the resonance frequencies of the ferromagnetic materials of the card to be read. The reading device, equipped with a system to measure the amplitude of the microwaves, can thus recognize the magnetic information elements on the card, through the disturbance or non-disturbance of the microwaves during the insertion of the card into the device. The value of the encoding of the card lies in fact that the information elements are hard to destroy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.