Object identification system employing pulsed magnetic field-stimulated, tag-embedded transponder
US6170748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1998 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Sep 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/083
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An object orientation-independent information storage and retrieval system `tags` an object with a compact, strip-embedded transponder containing object identification information. The transponder remains unpowered until the tagged object passes through a pulsed time-varying magnetic field generated by a tag reader. In response to a transponder coil sensing this interrogation magnetic field, the transponder extracts and stores energy from the incident field, powering up the transponder and stimulating the emission of an alternating magnetic field reply burst encoded with information stored in memory. The reply burst has the same frequency as the interrogating magnetic field burst, and is emitted by the transponder coil prior to receipt of the next interrogation burst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.