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US 2004/0106526 A1Published application
Method for marking liquid hydrocarbons
OwnerDavid Roderick Baxter, Peter John Cranmer +1inventors
InventorsDavid Roderick Baxter, Peter John Cranmer, Kim Sang Ho
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Abstract
A method for marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon: (i) at least one anthraquinone dye having an absorption maximum in the range from 710 nm to 850 nm selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthraquinone dimers; and (ii) at least one visible dye having an absorption maximum in the range from 500 nm to 700 nm.
Claims10
A method for marking a liquid petroleum hydrocarbon;
- said method comprising adding to said liquid petroleum hydrocarbon:
- (i) at least one anthraquinone dye having an absorption maximum in the range from 710 nm to 850 nm selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthraquinone dimers;
- and (ii) at least one visible dye having an absorption maximum in the range from 500 nm to 700 nm.
Dependencies are inferred from the claim text.