Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-08-16
2000-10-03
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
3405731, 340573, 340539, 340574, 340693, G08B 2300
Patent
active
061279315
ABSTRACT:
A device for monitoring the movement of a person including a homing unit and a base unit. The homing unit includes a device for generating a homing signal and a transmitter for transmitting the homing signal at predetermined intervals. The base unit includes a receiver for receiving the homing signal, a processor for processing the homing signal to determine whether the homing unit is within a predetermined distance from the base unit and generating an alarm signal upon determining the homing unit is at a distance from the base unit greater than the predetermined distance. An alarm is provided on the base unit for alerting a user that the homing unit has moved a distance greater than the predetermined distance from the base unit upon receipt of the alarm signal from the processor. The alarm is at least one of an audible alarm, a visible alarm and a vibratory alarm. At least one of the base unit and homing unit includes a device for adjusting the predetermined distance. The processor determines a time between receipt of sequentially transmitted homing signals to determine the distance between the base unit and homing unit. The base unit further includes a display for displaying the distance between the base unit and homing unit and a direction to the homing unit from the base unit.
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Kroll Michael I
Nguyen Tai T.
Wu Daniel J.
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