Device for prohibiting unauthorized use of electronic devices

Details Device for prohibiting unauthorized use of electronic devices Device for prohibiting unauthorized use of electronic devices

1997-12-30

2000-11-21

Hunter, Daniel S.

Telecommunications

Radiotelephone system

Out-of-range indication

455421, 455 66, 455 671, 455 69, 3405686, 340571, 3406866, 3405731, H04B 700, H04B 140, G08B 1314, G08B 2300, G08B 1700

Patent

active

061514934

ABSTRACT:
A use prohibition system which can disable a cellular phone or any other device if it separates more than a predetermined distance from the user, and at the same time give a warning to the user. It includes an identification signal transmission unit and a use prohibition mode canceling unit attached or mounted to the cellphone. Each unit has a transmitter and a receiver. The receiver of the canceling unit receives an ID code signal from the transmission unit and produces, based on the ID signal received, a use prohibition canceling signal. The canceling unit returns a confirmation signal to the transmission unit. If the two units separate more than a predetermined distance from each other, the levels of the ID signal and the confirmation signal received by the respective units drop below a predetermined value. Thus, the canceling unit stops producing the canceling signal to disable the cellphone, while the transmission unit sounds an alarm.

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