Security system with security access database distributed among individual access devices
US5319362A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Oct 14, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/27
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic security system includes a controller for controlling access to a location through activation of a lock mechanism in response to coded data and command instructions read from a key or card containing an electronic memory. The key memory data includes information specific to the keyholder which is decoded and acted upon by the controller. The controller memory can be reduced in size while still allowing the use of a large number of keys, by distributing a larger amount of data to the key memories. The controller is also capable of writing and altering key memory data in real time to control the subsequent use of the key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.