Process for identifying plastics by addition of fluorescent dye

US5201921A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Luttermann · Lohmar, DE
• Uwe Claussen · Leverkusen, DE
• Aziz El Sayed · Leverkusen, DE
• Reinhard Riess · Bensberg, DE

Key dates

• Filing date: Sep 6, 1991
• Grant date: Apr 13, 1993
• Expiry date: Sep 6, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S209/93
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Process for rendering a plastic identifiable by adding 5 to 10,000 ppb of a fluorescent marker to the plastic during or after is manufacture.