Large gap door/window, high security, intrusion detectors using magnetometers
US8970373B2 · kind B2 · utility
11Cited by
18References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2012 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Mar 7, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/18
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A door, or window detector incorporates a magnet and a magnetometer. Dual loop processing can be provided for real-time signals from the magnetometer, as the magnet moves relative to it, to determine when at least one of small gap or large gap indicating alarms should be issued. Security can be substantially increased by randomizing the orientation of the magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.