Method of constructing credit cards for automatic vending equipm

Details Method of constructing credit cards for automatic vending equipm Method of constructing credit cards for automatic vending equipm

1975-01-08

1977-05-03

Hall, Carl E.

Metal working

Electric condenser making

Solid dielectric type

235 6111H, 235 617B, 340149A, 361311, H01G 412

Patent

active

040205363

ABSTRACT:
A special method of credit card construction is provided with the credit card precoded in binary code representing several digits and with 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 arranged in several bit groupings related to a plurality of identification digits. In one embodiment of the cards, which are preferably of the plastic material type, opaque conductive plastic inserts may additionally be included over and above the first mentioned discs so that the discs, their location and code arrangement cannot be readily ascertained.

REFERENCES:
patent: 3245697 (1966-04-01), Nugent
patent: 3604900 (1971-09-01), Kalt
patent: 3641499 (1972-02-01), Housman
patent: 3716439 (1973-02-01), Maeda
patent: 3833929 (1974-09-01), Kirley

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