Mobile data media and a data exchange device

Details Mobile data media and a data exchange device Mobile data media and a data exchange device

1993-08-16

1995-03-28

Hajec, Donald

Registers

Systems controlled by data bearing records

Credit or identification card systems

235379, 235492, G06K 710

Patent

active

054019451

ABSTRACT:
The invention relates to a mobile data recording medium, in particular a data card, comprising a memory field having a number of bits which can be read, cleared and reloaded by means of a data exchange device, wherein the memory field includes a first memory region having a number of memory locations, each having at least a bit, each bit representing a value unit and each memory location representing a predetermined time interval, and that the memory field includes a second memory region having a plurality of bits which second memory region represents a time period predetermined by its beginning and its length, wherein the length of the time period is a multiple of said predetermined time interval.

REFERENCES:
patent: 4746786 (1988-05-01), Haberle et al.
patent: 4757186 (1988-07-01), Heberle et al.
patent: 4819204 (1989-04-01), Schrenk
patent: 5003520 (1991-03-01), Grier et al.

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