Method of storing a consumed amount in a card memory
US4963722A · kind A · utility
11Cited by
10References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1988 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Dec 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/08
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A new data recording method is provided in which a consumed amount of predetermined value is recorded in a card memory. Two recording areas are provided in a card memory. The first recording area consists of a plurality of record bits (a through j) which are unchangeable when marked. The second recording area consists of a changeable memory (M). Upper digits of the consumed amount are recorded in the first recording area so as to improve the factor of safety and lower digits of the consumed amount are recorded in the second recording area so as to improve the factor of freedom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.