Importance

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Abstract

An identification card is disclosed as for supporting commercial or other significant transactions involving a designated subject. The card incorporates a machine-readable record and includes a composition to characteristically modulate a light beam for individual card identification. In one embodiment, the card incorporates light-changing crystals (e.g. polaroid) to modulate a light beam. The machine-readable record on the card indicates: the light beam modulation, a coded personal identification for the subject card bearer, and a time-related value criterion involving use for the card. Systems are disclosed for variously sensing card characteristics by modulated light including polarized light techniques and from different aspects. A system for processing the cards is also disclosed including apparatus for sensing recorded signals representative of: a modulated light beam characteristic, a personal identification for the card holder, and a time-related use limitation. Computer structure is provided for comparing such signals with developed signals provided from the card and the user to verify that: the card is genuine, the user is proper, and the use is appropriate. A multiple-terminal system is disclosed wherein terminal inquiries are channeled to one of several processors for flexibility and reliability. The system incorporates apparatus for conditionally refreshing a card.

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First Claim