Anti-theft alarm for electrically operated devices
US5838225A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Aug 9, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/5004
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An anti-theft alarm is provided, for an externally powered electrically operated device which has an openable case containing internal components. The alarm comprises: PA1 a) a rechargeable battery PA1 b) a motion sensor to detect movement of the device, and a tamper switch to determine if the case is about to be opened or has been opened, PA1 c) a DC power supply connected to a circuit for recharging the battery, the DC supply being dependent on the external power supply for the device, PA1 d) a warning means activated by controller, powered by the battery, the controller being activated by a condition selected from the group consisting of i) no DC power and activation of the motion sensor and ii) activation of the tamper switch PA1 e) an arming latch which keeps the warning means activated when either of the conditions in d) is satisfied PA1 f) a key switch which is adapted to disarm the alarm when the DC power is off. The alarm is particularly useful for computers which are valuable in themselves or have valuable components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.