Telephone debit card

A debit card (1), especially for use in a "cashless" telephone, is of the type which is clipped or otherwise defaced for each unit used up and is transparent or has a transparent region which carries one or more patches (2) of an optical responsive material whose characteristics are such t...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	PETER SOTHCOTT
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING CHECKING-DEVICES COIN-FREED OR LIKE APPARATUS COMPUTING COUNTING DATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FORADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORYOR FORECASTING PURPOSES PHYSICS SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE,COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTINGPURPOSES, NOT OTHERWISE PROVIDED FOR
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A debit card (1), especially for use in a "cashless" telephone, is of the type which is clipped or otherwise defaced for each unit used up and is transparent or has a transparent region which carries one or more patches (2) of an optical responsive material whose characteristics are such that it is not readily forgeable and that it performs an "optical water-mark" function. Verification of a card offered for reading depends on the correct effect due to light incident on the card. In one form the responsive material is a film, which strongly reflects light incident on it when applied as a parallel beam P but weakly reflects or transmits diffusely applied light S. In another version a circularly polarising film formed by a linear polariser film backed by a quarter-wave plate or retarder is used.