Patent · US Expired

Method for marking liquids with at least two marker substances and method for detecting them

US6312958A · kind A · utility

40Cited by

13References

9Claims

0Family size

Assignee

BASF SE

Inventors

Frank Meyer · Mannheim, DE
Gerhard Wagenblast · Wachenheim, DE
Karin H. Beck · Ludwigshafen, DE
Christos Vamvakaris · Kallstadt, DE

Key dates

Filing date	Oct 20, 2000
Grant date	Nov 6, 2001
Priority date	—
Expiry date	Oct 20, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T436/21
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The present invention relates to a method of marking liquids using at least two markers, wherein said markers absorb in the 600-1200 nm region of the spectrum and reemit fluorescent light and the absorption range of at least one marker overlaps with the absorption range of at least one other marker. The present invention further relates to a method for detecting markers in liquids marked by the method of the invention, which comprises using light sources which emit radiation in the absorption ranges of said markers and detecting the fluorescent light reemitted by said markers, at least one of said light sources emitting radiation in the overlapping absorption range of at least one marker with that of at least one other marker and the number of light sources being less than or equal to the number of markers. The present invention further relates to liquids marked by the method of the invention.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.