Method of identifying a data carrier
US6179211A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1998 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Dec 8, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of identifying a data carrier such as a credit card, benefit card, access control card, identity card or stored value card, carrying data in the form of a plurality of rational number in a sequence, successive numbers having a marker between them, comprises a) measuring the distance from a fixed point on the data carrier to a given part of a marker, b) dividing this distance by the distance between corresponding give parts of successive markers, thereby obtaining a rational number, and c) subtracting this rational number from the number in the sequence adjacent the marker in a given direction, thereby obtaining a further rational number which is capable of identifying the data carrier uniquely.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.