Parking stall monitor
US4908617A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | May 10, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/14
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.