Coded key system using pulse polarity

Details Coded key system using pulse polarity Coded key system using pulse polarity

1990-05-08

1991-09-17

Trafton, David

Registers

Systems controlled by data bearing records

Credit or identification card systems

235449, 34082531, 34082559, G06K 500

Patent

active

050497294

ABSTRACT:
A contactless coded key system, comprising a key 2 and key terminal each housing circuitry enabling information to be transferred from terminal to key, and vice versa, and enabling the key to be powered from the terminal. This circuitry also comprises a light emitting diode and phototransister by means of which the presence of a key in the terminal is sensed. In a fuel monitoring application for a vehicle fleet, for example, each driver has a key enabling him to draw fuel from one or more depots each including a terminal. Fuel dispensed can be logged and fuel economy calculated.

REFERENCES:
patent: 4007355 (1977-02-01), Moreno
patent: 4345146 (1982-08-01), Story et al.
patent: 4471218 (1984-09-01), Culp
patent: 4625100 (1986-11-01), Smith
patent: 4650981 (1987-03-01), Soletta
patent: 4661691 (1987-04-01), Halpern
patent: 4797543 (1989-01-01), Watanabe

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