System for the checking of limited access to authorized time slots renewable by means of a portable storage device
US5768379A · kind A · utility
35Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1996 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Mar 7, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to systems for checking access limited to authorized time slots renewable by means of a portable storage device. The system comprises, for this purpose, an element (LE) producing electronic keys formed by a data element pertaining to a time slot and by the signature of this data element. These keys are loaded into devices such as memory cards (C). Electronic locks (L) capable of verifying the signatures are implanted in the different (physical or logical) locations, the access to which has to be guarded. Application to the checking of access to buildings or computer systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.