Lock system
US4207555A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Mar 3, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00761
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic lock system including a key coder, a key or set of keys and a lock or set of locks. The key coder provides an operator-selectable key code having a new code portion and current code portion to each key. The key receives the selected key code from the key coder and retains it for use with the lock or set of locks, one at a time. When the lock receives the key code from the key, a comparison is made in the lock between the current code portion of the key code and a lock code contained within a memory in the lock. If the current code portion of the key code compares the lock code, the lock is actuated and the lock code in the memory is replaced by the new code portion of the key code. If the new code portion of the key code is identical to the current code portion of the key code, the key will actuate the lock and will continue to do so until the lock is once actuated by a key having a different new code portion of the key code. Thereafter, the remaining keys in the set will not actuate the lock until their key code is changed by the key coder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.