Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-08-19
1998-01-13
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
119721, 340539, 340572, G08B 13181, G08B 2100
Patent
active
057084211
ABSTRACT:
A system for tracking articles or persons comprising a base unit for transmitting a series of ultrasonic signals and an alarm signal, a remote unit, removably attached to the article or person, for receiving the series of ultrasonic signals from the base unit and for transmitting an electromagnetic signal upon receipt of the ultrasonic signal from the base unit, and a monitoring unit for receiving the alarm signal. The base unit further includes an ultrasonic signal generator, an ultrasonic signal transmitter, an electromagnetic signal receiver for receiving the signal from the remote unit, a timer for determining the amount of time from the transmission of the ultrasonic signals to the receipt of the electromagnetic signal from the remote unit, and a transmitter for transmitting an alarm signal to the remote unit and the monitoring unit when the amount of time from the transmission of the ultrasonic signals to the receipt of the electromagnetic signal from the remote unit is greater than a predetermined amount of time.
REFERENCES:
patent: 4598272 (1986-07-01), Cox
patent: 4675656 (1987-06-01), Marcisse
patent: 4785291 (1988-11-01), Hawthorne
patent: 4967695 (1990-11-01), Giunta
patent: 5119072 (1992-06-01), Hemingway
patent: 5196825 (1993-03-01), Young
patent: 5289163 (1994-02-01), Perez et al.
patent: 5396218 (1995-03-01), Olah
patent: 5583488 (1996-12-01), Sala et al.
patent: 5589821 (1996-12-01), Sallen et al.
Radio Systems Corp.
Swann Glen
LandOfFree
System for tracking an article or person does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for tracking an article or person, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for tracking an article or person will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-329938