Patent ID: 6154665
Filing Date: 2000-11-28
Classification: H04B,H04M,H04W,Y02D

Abstract:
A proximity detector system for a radio telephone comprising:a radiotelephone controlled by a microprocessor;a first detector operatively associated with said microprocessor, said first detector having a transmitter, a receiver, and a controller, said transmitter generating a first proximity signal;a second detector detachably mounted to said radiotelephone, said second detector having a transmitter and a receiver, said transmitter generating a second proximity signal in response to the receipt of said first proximity signal; andwherein the said first proximity signal is generated only when said second detector is detached from said radiotelephone, and wherein the controller of the first detector measures the signal strength of the second proximity signal and compares said strength to a predetermined threshold, said controller further causing said microprocessor to disable operation of the radiotelephone when said signal strength of the second proximity signal is below said predetermined threshold.