Use of compounds which absorb and/or fluoresce in the IR region as markers for liquids

US5804447A · kind A · utility

Assignee

• BASF SE

Inventors

• Bernhard Albert · Monsheim, DE
• Juergen Kipper · Karlsruhe, DE
• Christos Vamvakaris · Kallstadt, DE
• Karin H. Beck · Ludwigshafen, DE
• Gerhard Wagenblast · Wachenheim, DE

Key dates

• Filing date: Apr 23, 1997
• Grant date: Sep 8, 1998
• Expiry date: Apr 23, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T436/13
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Use of compounds from the class of the phthalocyanines, naphthalocyanines, nickel dithiolene complexes, aminium compounds of aromatic amines, methine dyes or azulenesquaric acid dyes which have their absorption maximum in the range from 600 to 1,200 nm and/or a fluorescence maximum in the range from 620 to 1,200 nm, as markers for liquids, a process for detecting markers in liquids, and a detector suitable for this purpose.