Parking stall monitor

Communications: electrical – Vehicle parking indicators

Patent

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Details

368 90, G08G 114

Patent

active

049086170

ABSTRACT:
A parking stall monitor located adjacent a restricted use parking stall periodically transmits a burst of ultrasonic pulses into the parking stall during a first time interval and then periodically detects the reflection of the ultrasonic pulses off of a vehicle in the parking stall during a second time interval, the first and second time intervals being staggered in time. Upon detecting vehicle presence in the stall, the monitor provides an audible warning to indicate that use of the stall is restricted. Before and after authorized use of the stall, the monitor can be selectively disarmed and then rearmed, respectively, by a signal transmitted from a portable transmitter within the authorized vehicle.

REFERENCES:
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patent: 3015087 (1961-12-01), O'Gorman
patent: 3045909 (1962-07-01), Auer Jr.
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patent: 3440633 (1969-04-01), Vinding
patent: 3849936 (1974-11-01), Geraci
patent: 4095739 (1978-06-01), Fox et al.
patent: 4310890 (1982-01-01), Trehn et al.
patent: 4356903 (1982-11-01), Lemelson et al.
patent: 4713910 (1987-12-01), Quante

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