Microcomputer controlled locking system
US5986564A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1993 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Aug 5, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7073
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A locking system is disclosed which comprises a microcomputer controlled lock with multiple level keying, i.e. multiple keys having different functions in the locking system. A key reader, for example punch card or magnetic type, reads key code into the microcomputer. A read/write memory has a predetermined number of assigned key codes stored therein and a read-only memory has a control program stored therein for control of the microcomputer. An electrically controlled actuator for the locking means is coupled with an unlocking output of the microcomputer. The control program comprises a main program and a plurality of subroutines each stored at a different location in the read-only memory. A function table has a number of pointers each of which points to the memory address of one of the subroutines. The number of pointers in the function table is equal to the number of locations in the key code memory. Decoding means operative under program control in conjunction with a control code on the key points to selected locations in the key code memory and the function table corresponding to the control code. The microcomputer, under control of the main program, compares the primary and s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.