04523087 is referenced by 137 patents and cites 5 patents.

A system for providing authorization to complete a requested transaction comprises a portable verification device (20) carried by each user to be inserted into a receptacle (34) at a point of transaction for authorization verification. The portable device (20) comprises a housing (22) containing data processing and storage circuitry, a keyboard (24) for manually entering identification and transaction data, and a display. An optical transceiver (70) exposed through the housing (22) establishes a bidirectional optical data link between the portable device (20) and a corresponding optical transceiver (80) in the receptacle (34). The optical data link is preferably in the non-visible wave length range, e.g. infrared, to make the system immune to ambient visible light and to mask optical data from the user. The portable device can be used either in an off-line mode, wherein transaction data, such as account balance and user restrictions, are stored in memory within the device and transactions are approved based upon keyboard entered data and data stored in device (20), or in an on-mode, wherein transactions are authorized based upon keyboard entry of the personal identification number and data coupled between the portable device and a host computer via the optical channel. Vouchers (30) are imprinted by a thermal print head (56) within device (20) following authorization.

Title
Transaction verification system using optical coupling data communication link
Application Number
6/451169
Publication Number
4523087
Application Date
December 7, 1982
Publication Date
June 11, 1985
Inventor
William M Benton
2888 NE. 25th Ct., Fort Lauderdale, 33305
FL, US
Agent
Lowe King Price & Becker
IPC
G06F 15/30
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