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US 5,672,182 AGranted
Developer system for base reactable petroleum fuel markers
AssigneeUnited Color Manufacturing, Inc.
InventorMichael J. Smith
Life of this patent
Estimating the term…
Abstract
Colorless markers for petroleum products and methods of detecting them.
Claims29
A method of identifying a petroleum product containing a base reactable marker comprising:
- a) obtaining a sample of petroleum product containing a base reactable marker;
- b) adding to said sample a developing agent comprising a quaternary alkyl ammonium base of the following formula:
- ##STR9## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different alkyl or benzyl groups and R.sub.5 is hydrogen or an alkyl group.
A marker as recited in claim 13 wherein said solvent is comprised of about 40% aprotic solvent and about 60% aromatic solvent, said aromatic solvent being miscible in said petroleum product.
A method of identifying a petroleum product containing a base reactable marker, without subsequent extraction, comprising:
- a) obtaining a sample of petroleum product containing a base reactable marker;
- b) adding to said sample a developing agent comprising a quaternary alkyl ammonium base of the following formula:
- ##STR10## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different alkyl or benzyl groups and R.sub.5 is hydrogen or an alkyl group.
A marker for petroleum products comprising at least one compound selected from the group consisting of:
- ##STR11## wherein R.sub.1 is an alkyl of 1-18 carbon atoms or an aryl group;
- R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, chlorine, bromine or C.sub.1 -C.sub.12 alkyl and R.sub.6 is hydrogen, chlorine or bromine. said R.sub.1 -R.sub.6 may be the same or different groups and alkyl groups may be straight chain or branched chain;
- with at least one compound selected from the group consisting of:
- ##STR12## wherein R.sub.7 is an alkyl or alkoxy group containing 1 to 8 carbon atoms;
- R.sub.8 and R.sub.9 are hydrogen, alkyl or alkoxy groups;
- R.sub.10 is any combination of bromine, chlorine, or hydrogen and R.sub.11 is hydrogen, an alkyl or an alkoxy group containing C.sub.1 -C.sub.8.
3 more elements
Dependencies are inferred from the claim text.