Method for operating installations comprising chip-card-driven control systems
US5298724A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 1992 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Feb 25, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to a method for the coding and the availability of a chip card, which is provided as memory storage in a programmable control system. During the initial operation of a chip card with a control system a coding process is performed. The coding process specifies the chip card to the control system and encodes the chip card. The chip card can only be copied after the coding process. However, the copy can only be used in the control system on which the original or master chip card was coded. In the event of a defect in the system hardware, a chip card may be used in a second control system so that the total system installation remains available. The second control system remains functionally operable with a chip card for a time-limited period if the code of the chip card does not coincide with the code of the control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.