06811575 is referenced by 9 patents and cites 4 patents.

Method for invisibly marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon at least one dye selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthraquinone dimers. The absorption maximum of the dye(s) is in the range from 710 nm to 850 nm.

Title
Method for marking hydrocarbons with anthraquinones
Application Number
10/308618
Publication Number
6811575 (B2)
Application Date
December 3, 2002
Publication Date
November 2, 2004
Inventor
Yu Min Chen
Belmont
MA, US
Kim Sang Ho
Richboro
PA, US
Agent
Kenneth Crimaldi
US
Assignee
Rohm and Haas Company
PA, US
IPC
D06P 3/00
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