Heat-destructible magnetic memory element
US4403138A · kind A · utility
18Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1981 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | May 15, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Magnetic memory element for transport ticket or credit card, comprising a support and at least one ferromagnetic layer containing at least one piece of information recorded therein and a layer of a non-magnetic diffuser in contact with the ferromagnetic layer to irreversibly destroy the magnetism of the ferromagnetic layer when the element is heated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.