Polarizer based detector

US6648221B2 · kind B2 · utility

Assignee

• MARS, INCORPORATED · US

Inventors

• Jeffrey T. Thawley · Claymont, US
• Edward M. Zoladz, Jr. · West Chester, US
• Philippe Jard · Downingtown, US
• David C. Deaville · West Chester, US
• Bernard Bouchet · Oyonnax, FR
• Jerome Daout · Rolle, CH
• Robert Clauser · Columbus, US
• Michael D. Nunn · West Chester, US

Key dates

• Filing date: Nov 30, 2001
• Grant date: Nov 18, 2003
• Expiry date: Nov 30, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G07F1/044
• WIPO field: Control
• WIPO sector: Instruments

Abstract

Apparatus and method for detecting strings attached to bills or other forms of payment in a currency validator. In one implementation a string fraud detector uses polarized light to detect a string. In another implementation, polarized light and light in a different range of wavelengths are used to detect a string.