Short range wireless tracking and event notification system for portable devices
US7791469B2 · kind B2 · utility
4Cited by
13References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2006 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Oct 4, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1427
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and system for tracking a portable device. A tracking system includes a portable device, a first Radio Frequency (RF) module, and a second RF module. The first Radio Frequency (RF) module is installed in the portable device for transmitting a wireless signal. The second RF module is used for receiving the wireless signal. When a received amplitude of the wireless signal that is received by the second RF module is less than a predetermined value, the second RF module generates an alert.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.