System for controlling the use of portable data media
US5103079A · kind A · utility
80Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1989 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Jun 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/403
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
The invention relates to making use of a "black" list in a system where goods or services are provided in response to a memory card being presented. The complete "black" list is stored in the memory (46) of a computer center (40). The identification numbers of the cards are subdivided into a plurality of classes. The memory (28) of each local terminal (10) stores the ranks of classes having at least one identification number on the "black" list.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.