Method for storing data in a chip card rewritable memory
US6484937B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1999 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Aug 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0246
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A storage process that includes adding, to the elementary files of fixed length provided for by, e.g., ISO Standard 7816-4, elementary files of variable length whose capacity is always adapted to the size of the records they store, and managing this new type of file with micro-instructions complying with the formalism of ISO Standard 7816-4 and belonging to the proprietary class of instructions. By virtue of this new type of variable-length elementary file, it is possible to envisage new smartcards complying with ISO Standard 7816-4 and implementing data compression techniques at the data storage level, this capability being particularly beneficial considering the limited data storage capacities of a smartcard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.