Proximity detection and alerting
US7843327B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2008 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Dec 30, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/5009
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method of monitoring a portable electronic device electronically is provided. The method comprises receiving a first radio signal, the first radio signal emitted by the electronically monitored portable electronic device and determining a first received signal strength of the first radio signal. The method also comprises receiving a second radio signal, the second radio signal emitted by the electronically monitored portable electronic device, the second radio signal received after the first radio signal. The method also comprises determining a second received signal strength of the second radio signal, comparing the second received signal strength to the first received signal strength, and alerting when a result of the comparing exceeds a threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.