Electronic locking apparatus
US4742426A · kind A · utility
19Cited by
2References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1987 |
| Grant date | May 3, 1988 |
| Priority date | — |
| Expiry date | Mar 27, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/00722
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A battery powered electronic lock includes a control for indicating low battery voltage and reserving a portion of the battery's energy for operating the lock upon insertion of maintenance or emergency keys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.