Retail theft prevention and information device
US5589820A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1995 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | Oct 11, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2474
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A device for use in preventing theft of an item from a building and for use in identification of the item is disclosed. The device comprises an antenna adapted to receive a frequency signal from an external device and for generating a voltage in response to receiving the frequency signal; a capacitor coupled to the antenna for storing the antenna voltage and for supplying an activation signal; a piezoelectric device for receiving an activation signal; a power supply; a memory device for digitally storing the code and for outputting the digital code upon receiving power from the power supply; a switch with normally open contacts coupled to the capacitor and to the piezoelectric device, the switch being operable to couple the power supply to the memory device upon the piezoelectric device receiving an activation signal; and a voltage to frequency converter, coupled to the memory device, for converting the digital code to frequencies representing the digital code, the voltage to frequency converter being coupled to the antenna so that the antenna transmits the frequencies representing the code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.