Marker for remote detection of articles
US7075439B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2002 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Oct 7, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2448
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A marker for remote detection of articles has an elongated sensor element with magnetic and electric properties. The elongated sensor element provides an electromagnetic reply signal when receiving an electromagnetic input signal. The elongated sensor element modulates the electromagnetic reply signal in response to an external magnetic modulating field. The marker also has means positioned in a vicinity of the elongated sensor element in the marker. The means is adapted to influence either the magnetic or the electric properties of the elongated sensor element in response to incident electromagnetic or magnetic energy, so that either the electromagnetic reply signal itself or the modulation thereof is substantially changed from an active state to a deactivated state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.