Methods and systems for activating a proximity information device
US8314702B2 · kind B2 · utility
5Cited by
12References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2009 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Sep 23, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A proximity information device includes a body, a radio frequency identification (RFID) integrated circuit (IC) supported by the body, and a threshold detector coupled to the RFID IC. The RFID IC is operative to transmit a response message in response to an interrogation signal if the threshold detector indicates that a detected magnetic and electric field and the relative strength of magnetic field compared to the electric field satisfy a predetermined threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.