Automatic vending equipment and credit purchase systems

Details Automatic vending equipment and credit purchase systems Automatic vending equipment and credit purchase systems

1975-10-20

1976-11-30

Yusko, Donald J.

Communications: electrical

Digital comparator systems

235 6111H, 324 60R, 328148, G06F 700, G11B 2300, G01R 2924

Patent

active

039952550

ABSTRACT:
The credit card is precoded in binary code representing several digits and has a locator indicator to insure that the card is correctly positioned when inserted in the console or read-out station. The card coding includes the method of arranging high dielectric constant spots or discs and low dielectric constant spots or discs in several groupings related to a plurality of identification digits. The circuitry for reading the encoded data on the credit card includes a capacitive voltage divider to reduce the effect of parasitic capacitance. Additionally, a relatively high voltage level sensing circuit is used to reduce the possibility of error due to oxide film, dirt, high resistance film or the like on the encoded spots.

REFERENCES:
patent: 2785388 (1957-03-01), McWhirter et al.
patent: 2914746 (1969-11-01), James
patent: 3587051 (1971-06-01), Hovey
patent: 3593319 (1971-07-01), Barber
patent: 3626157 (1971-12-01), Smith
patent: 3646457 (1972-02-01), David et al.
patent: 3930405 (1976-01-01), Renken, Jr.

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