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US4902882A · kind A · utility
13Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1987 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Sep 23, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/084
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A reliable electronic lock comprises means for reading a key card upon insertion and withdrawal. Sets of data read from the key card are compared to CRC data read from the key card to determine which set contains actual data and no false data erroneously read by the electronic lock. The CRC data is stored in scrambled form on the card to minimize the possibility of match to a set of actual and false data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.