Door lock assembly with electrical alarm
US4360803A · kind A · utility
16Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1979 |
| Grant date | Nov 23, 1982 |
| Priority date | — |
| Expiry date | Jun 5, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05B45/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door lock assembly having an electrical alarm system includes a piezoelectric element located between the lock bolt of the door lock and the lock frame in order to emit a signal to energize the electrical alarm system when pressure is applied between the lock bolt and the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.