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US 5,490,872 AGranted
Acid extractable petroleum fuel markers
AssigneeMorton International, Inc.
InventorsMichael R. Friswell, Michael J. Hallisy, Michael P. Hinton
Life of this patent
Estimating the term…
Abstract
Petroleum fuels are tagged with markers having the formula: ##STR1## where R.sup.1 and R.sup.2 are selected from H, methyl, ethyl, methoxy, halogen, cyano and nitro and R.sup.3 is selected from methyl, methoxy methoxyethoxy and morpholino.
Claims3
A method of tagging a liquid petroleum fuel and identifying the tagged petroleum fuel, the method comprising adding to said liquid petroleum fuel a detectable level of a marker having the formula:
- ##STR3## where R.sup.1 and R.sup.2 are selected from H, methyl, ethyl, methoxy, halogen, cyano and nitro and R.sup.3 is selected from methyl, methoxy, methoxyethoxy and morpholino, and extracting said marker from said tagged petroleum fuel with an acidic aqueous medium, thereby developing a color.
Dependencies are inferred from the claim text.