Pyrazinoporphyrazines as markers for liquid hydrocarbons

Chemistry of hydrocarbon compounds – Product blend – e.g. – composition – etc. – or blending process... – With nonhydrocarbon additive

Reexamination Certificate

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C585S005000, C508S203000, C508S204000, C508S256000, C436S056000, C436S139000, C044S320000, C044S335000

Reexamination Certificate

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10465211

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.

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