Registers – Calculators – Input-output calculator to indicator – printer – etc.
Patent
1975-05-19
1977-05-17
Cook, Daryl W.
Registers
Calculators
Input-output calculator to indicator, printer, etc.
235 6111D, 360 40, 360 51, G06K 500, G06K 708, G11B 509
Patent
active
040243796
ABSTRACT:
A control system is described for activating a machine using magnetic signals encoded on a magnetic card, tape or equivalent member. The magnetic signals are pulse-width-modulated and, in one embodiment, also sawtooth-modulated. A means is provided which is responsive to the magnetic signals for generating a first and a second number. The first number corresponds to the number of times the magnetic card is usable for activating a machine. The second number is provided for identification and validation purposes. Means are also provided for reducing the number of times the card can be used each time it is used to activate a machine and for visually displaying that number on a visual display device. The use of skewed recording and reproduction heads is also described for improving signal discrimination and security against the usability of fraudulently produced magnetic cards.
REFERENCES:
patent: 3683413 (1972-08-01), Schlaepfer
patent: 3697729 (1972-10-01), Edwards et al.
patent: 3750828 (1973-08-01), Constable
patent: 3845277 (1974-10-01), Voss et al.
Breeze Eric G.
Pfost R. Fred
Caplan Julian
Cook Daryl W.
Service Distributors, Inc.
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