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US 7,157,611 B2Granted
Pyrazinoporphyrazines as markers for liquid hydrocarbons
AssigneeRohm and Haas Company
InventorsRajiv Manohar Banavali, Kim Sang Ho
Life of this patent
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Abstract
A method for marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon a pyrazinoporphyrazine dye having an absorption maximum from 700 nm to 900 nm.
Claims9
A method for marking a liquid petroleum hydrocarbon;
- said method comprising adding to said liquid petroleum hydrocarbon from 0.01 ppm to 10 ppm of at least one pyrazinoporphyrazine dye having an absorption maximum from 700 am to 900 nm.
Dependencies are inferred from the claim text.