Electronic tracing system

Details Electronic tracing system Electronic tracing system

2000-01-11

2000-12-26

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340539, 340574, 455421, 455420, 455410, 455429, G08B 2300

Patent

active

061666424

ABSTRACT:
An electronic tracing system 10 is provided for sensing when a child moves more than a predetermined distance from a guardian. The system comprises a first module 20 for attaching to the child and a second module 30 which is carried by the guardian. The first module is adapted alternately to broadcast location signals and change to a receiving mode between the broadcasts. The second module is adapted to detect the location signals and includes means 200 for processing the location signals to determine whether the distance apart of the modules exceeds the predetermined distance. If the predetermined distance is exceeded then a buzzer 140 is activated and an LED 150 flashes to inform the guardian of this. The guardian can then press a push button switch 160 on the second module to transmit an alarm signal to the first module so as to cause a connected smoke canister 105 to emit smoke.

REFERENCES:
patent: 4598272 (1986-07-01), Cox
patent: 4758826 (1988-07-01), Wall
patent: 5638044 (1997-06-01), Chua
patent: 5661460 (1997-08-01), Sallen et al.
patent: 5708421 (1998-01-01), Boyd
patent: 5841352 (1998-11-01), Prakash
patent: 5905461 (1999-05-01), Neher

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