System for monitoring parked vehicles

Details System for monitoring parked vehicles System for monitoring parked vehicles

1992-07-20

1994-08-16

Williams, Hezron E.

Communications: electrical

Vehicle parking indicators

340928, G08G 114

Patent

active

053390008

ABSTRACT:
A parking system includes a portable parking tag for each vehicle and a reading device. The portable parking tag includes a non-contact data communications circuit for effecting data transfer by mutual electromagnetic coupling with the reading device, a memory coupled to the data communications circuit for storing at least one parking parameter, and an antenna coupled to the data communications circuit for transmitting a first signal representative of each parking parameter. The reading device includes an antenna for receiving a first signal, a reading circuit coupled to the antenna and responsive to the first signal for reading each parking parameter stored in the parking tag memory, a validity verification circuit coupled to the reading circuit and responsive to the first signal for generating a validity signal, and output circuit coupled to the validity verification circuit and responsive to the validity signal for producing a visual or audible output signal.

REFERENCES:
patent: 4303904 (1987-12-01), Chasek
patent: 4310890 (1982-01-01), Trehn et al.
patent: 4730285 (1988-03-01), Lie
patent: 4876540 (1989-10-01), Berthon

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