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US 5,804,447 AGranted
Use of compounds which absorb and/or fluoresce in the IR region as markers for liquids
AssigneeBASF SE
InventorsBernhard Albert, Juergen Kipper, Christos Vamvakaris, Karin Heidrun Beck, Gerhard Wagenblast
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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.
Claims10
A method of identifying a liquid comprising the sequential steps of:
- i) detecting a marker compound in a liquid;
- and
- ii) identifying said liquid based on the identity of said marker compound,
- wherein said marker compound is selected from the group consisting of a metal-free phthalocyanine, a metal-containing phthalocyanine, a metal-free naphthalocyanine, a metal-containing naphthalocyanine, a nickel dithiolene complex, an aminium compound of an aromatic amine, a methine dye, an azulenesquaric acid dye and a mixture thereof,
- wherein said marker compound has an absorption maximum in the range of from 600 to 1,200 nm and/or a fluroescence maximum in the range of from 620 to 1,200 nm.
2 more elements
Dependencies are inferred from the claim text.