Static information storage and retrieval – Read/write circuit – Serial read/write
Patent
1994-12-13
1996-12-24
Lane, Jack A.
Static information storage and retrieval
Read/write circuit
Serial read/write
235492, 257679, G06K 1904, G06K 1906, H01L 2504, G11C 700
Patent
active
055879551
ABSTRACT:
An electronic token has at least two conductive surfaces which form either in total or in part a crush resistant casing in which a semiconductor memory is placed. Coupled to the two conductive surfaces is a set of input logic which is used to detect whether or not the first conductive surface is coupled to a device in which a first voltage or a second voltage is present and in which data can be stored in the semiconductor memory accordingly. Output logic is also provided so as to selectively poll the first conductive surface of said casing towards the second voltage with the output logic being electronically coupled to the semiconductor memory so that data may be retrieved from the stored memory. The stored information may be used for controlling access to items, for example as a lock. It may further be used as an inventory control device, postage control device, currency device for the sale of goods. This item can act as a portable storage device which allows through its updating capabilities a mechanism for updating values within the device, such as money units or their equivalents.
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Bolan Michael L.
Curry Stephen M.
Deierling Kevin E.
Diaz Donald R.
Kurkowski Hal
Dallas Semiconductor Corporation
Lane Jack A.
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