Proximity detection and alerting

Details Proximity detection and alerting Proximity detection and alerting

2008-05-06

2010-11-30

Nguyen, Tai T (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S539150, C340S539210, C340S505000, C340S573100, C340S573400, C340S577000, C340S692000, C340S815450, C455S456100, C455S456600

Reexamination Certificate

active

07843327

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.

REFERENCES:
patent: 4675656 (1987-06-01), Narcisse
patent: 4785291 (1988-11-01), Hawthorne

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