Class 44/328 - Azo compound (i.e., each of the nitrogens is single bonded to carbon)

Subclass of Class 44 - Fuel and related compositions
Definition: Compositions which contain an azo compound, i.e., a compound
No. of patents: 35
Last issue date: 11/01/2011

Number	Title	Issue Date
8048175	Quick removal of mercaptans from hydrocarbons Mercaptans and/or hydrogen sulfide (H2S) in hydrocarbons, naphthas, gasolines, and the like may be scavenged therefrom by being brought into intimate contact with a mercaptan scavenger formulation containing at least one disubstituted azodicarboxylate of ...	11/01/2011
7223606	Methods of detecting nitrotyrosine and aminotyrosine residues of peptides and proteins Methods and compositions are disclosed for quantifying and/or identifying a nitroderivative compound, or a residue thereof, and are applicable for assessing in vivo nitrative stress and for aiding in diagnosis of mammalian pathologies such as asthma, atherosclerosis...	05/29/2007
6800102	Emergency fuel An emergency fuel for an internal combustion engine comprises a hydrocarbon solvent having a flash point of at least 100° F. (such as about 65-75% paraffins and about 25-35% naphthenes, or about 75-85% paraffins and about 15-25% of C7 or higher alcohols, or an arom...	10/05/2004
6558439	Emergency fuel An emergency fuel for an internal combustion engine comprises a hydrocarbon solvent having a flash point of at least 100° F. (such as about 65-75% paraffins and about 25-35% naphthenes, or about 75-85% paraffins and about 15-25% of C7 or higher alcohols,...	05/06/2003
6514917	Molecular tags for organic solvent systems Colorless markers for petroleum products and methods and composition for detecting them....	02/04/2003
6339145	Use of amino azoic dyes as markers of oil distillation products Amino azoic dyes having general formula (I) wherein: R1 is linear or branched alkyl having from 6 to 20 carbon atoms; R2 and R3 are independently H, CH3, C2 H5, OCH3 or OC2...	01/15/2002
6274381	Method for invisibly tagging petroleum products using visible dyes This invention provides a method for invisibly tagging, for subsequent identification purposes, various liquid petroleum hydrocarbons, such as crude oil, diesel fuel, heating oil, kerosene, lubricating oils, waxes, jet fuel, and in particular gasoline, re...	08/14/2001
5827332	Azo dyes and a method of making a hydrocarbon using an azo dye Azo dyes of the formula ##STR1## where the ring A may be benzofused, n is 0 or 1, and R1 -R8 are as defined, as pH-dependent markers for hydrocarbons, hydrocarbons containing the above-mentioned azo dyes, and a method for detecting t...	10/27/1998
5759857	Leak detection using chemical markers Leakage in a heat exchanger between two liquids which are in indirect heat exchange relationship is detected by marking one of the two liquids with a colorless chemical marker and detecting it in the second liquid by extraction and conversion to a colored...	06/02/1998
5737871	Method of preparing and utilizing petroleum fuel markers Compounds known as "solid dispersed dyes" are synthesized in a two-phase system from which they disproportionate into a water-immiscible solvent phase, providing marker solutions. Marker solution is added to a petroleum fuel to introduce the compound ther...	04/14/1998
5676708	Non-mutagenic dye A dye composition that presents lower mutagenic characteristics useful in coloring petroleum products comprising a substantial amount of the dye of the formula ##STR1##...	10/14/1997
5627077	Anilines as markers for mineral oils Anilines of the formula ##STR1## where R1 and R2 are each hydrogen, unsubstituted or substituted alkyl, alkenyl or unsubstituted or substituted phenyl or R1 and R2, together with the nitrogen atom linking them a...	05/06/1997
5490872	Acid extractable petroleum fuel markers Petroleum fuels are tagged with markers having the formula: ##STR1## where R1 and R2 are selected from H, methyl, ethyl, methoxy, halogen, cyano and nitro and R3 is selected from methyl, methoxy methoxyethoxy and morp...	02/13/1996
5487770	Detection of marked mineral oils and novel azo dyes Method for detecting marked mineral oils by treating the marked mineral oil with an extractant comprising water, a solvent and a base comprises using as marker an azo dye of the formula ##STR1## where ring A may be benzofused, m is from 1 to 4, X	01/30/1996
5428137	Monoazo liquid dye and solutions thereof The monoazo compound represented by formula I is excellent in compatibility with, solubility in, and coloring power for, almost all water-immiscible organic liquids, has a low melting point, and is suitable for use to color molten plastics, synthetic fibe...	06/27/1995
5266227	Oil-soluble phenylazoaniline dyes Azo dyes useful for marking mineral oils have the formula ##STR1## where R1 and R2 are hydrogen, C1 -C4 -alkyl or C1 -C4 -alkoxy, R3 is hydrogen or C1 -C8 -...	11/30/1993
5252106	Base extractable petroleum markers Liquid petroleum products are marked with markers having the formula: ##STR1## where the Ws are selected from O--(C1 -C3 alkyl) and hydrogen, provided that at least one W is O--(C1 -C3 alkyl), the Xs and Ys ...	10/12/1993
5156653	Silent markers for petroleum, method of tagging, and method of detection Liquid petroleum products are marked with markers having the formula: ##STR1## wherein the R1 's and the R2 's are the same or different and are each selected from --H and C1 -C7 alkyls; provided that at le...	10/20/1992
5147413	Methanol fuel containing flame luminosity agent The flame luminosity of a methanol fuel is appreciably enhanced by the addition thereto of at least one azo dye flame luminosity enhancing agent....	09/15/1992
4904765	Dye mixtures containing an oil-soluble dye and an acid-extractable dye Dye mixtures contain an oil-soluble dye and a dye of the formula ##STR1## where D is phenyl which is unsubstituted or substituted by methyl or methoxy, R is hydrogen or methyl, R1 is hydrogen or C1 -C4 -alkyl and R	02/27/1990
4800847	Anaerobic operation of an internal combustion engine A process for running an internal combustion engine is disclosed. The process comprises running the engine in communication with ambient air and with a fuel that is, at the compression ratio of the engine, capable of undergoing combustion in air containin...	01/31/1989
4764290	Identification marking of oils Hydrophilic dye is added to oil for providing identification to the oil. The dye is dispersed in the oil in the form of polymolecular particles less than 1 mm. in diameter, for example, as an emulsion. Accordingly, the sample of oil may be exposed to a po...	08/16/1988
4723964	Cetane number improvement Liquid hydrocarbon fuels having an enhanced cetane number include at least one azo compound having the formula: wherein R1 and R2 are the same or different organo groups, each containing 1 to about 10 carbon atoms....	02/09/1988
4514226	Monoazo pyridone colorants A colorant of the formula: ##STR1## wherein R1 R2 and R3 independently of one another are each C1 -C18 -alkyl, C1 -C18 -alkenyl, C4 -C9 -alkoxyalkyl, C...	04/30/1985
4479899	Red dyeing 2,6-dicyano-2'-sulfonamido-4'-amino-azo-benzenes Azo compounds of the formula ##STR1## wherein R1 is alkyl, alkenyl, aralkyl, aryl or hetaryl, R2 is hydrogen or alkyl, R3 is hydrogen, alkyl, halogen, OR1 etc. R4 is hydrogen, alkyl, aralkyl, aryl or cyclo...	10/30/1984
4473376	Dye mixtures of azo compounds soluble in organic solvents A mixture, soluble in organic solvents, of compounds of the formula ##STR1## where D is a radical of the formula ##STR2## n is 0, 1, 2 or 3 and R1 and R2 independently of one another are hydrogen, C1 -C4	09/25/1984
4315756	Oil-soluble azo dye with N-substituted ଲ-naphthylamine as coupling component Monoazo and disazo dyes having an unsubstituted or substituted aniline or p-aminoazobenzene as diazo component and an N-substituted ଲ-naphthylamine of six to eighteen carbon atoms in the N-substituent as coupling component. Preferred diazo component...	02/16/1982
4210414	Dye mixtures for coloring mineral oil products Mixtures of dyes of the formula ##STR1## where R is hydrogen or methyl and n is a number from 0 to 6 are exceptionally suitable--especially when used in the form of stock solution--for coloring mineral oil products....	07/01/1980
4082501	Mixtures of oil-soluble phenyl- and naphthyl-azo-phenyl dyestuffs Mixtures of dyestuffs of the formula ##STR1## wherein R1 and R2 are hydrogen, lower alkyl or lower alkoxy and A is hydroxy phenyl or ଲ-hydroxy naphthyl. These dyestuff mixtures are prepared in usual manner by diazotizing a...	04/04/1978
4056367	Liquid monoazo-naphthalene dyestuffs, and their use Liquid dyestuffs of the general formula: ##STR1## in which A and B each represent the residue of an aromatic benzene or naphthalene primary amine, possibly substituted by alkyl or alkoxy groups containing 1 to 2 carbon atoms, n represents 0 or 1, y r...	11/01/1977
4042579	Liquid disazo dyestuffs derived from diphenylsulphide Liquid dyestuffs of the general formula: ##STR1## in which y represents 0 or 1, x and z each represent a whole number in which the sum x + y + z is a whole number from 5 to 17; a process for the preparation of such dyestuffs in which the bis-diazo de...	08/16/1977
4011209	Organic solvent-soluble azo dyes Azo dyes which are highly soluble in organic solvents are disclosed. The dyes have the general formula ##STR1## in which M = 1 TO 3; n = 1 or 2; X = h or NO2 ; Y = h, cl, NO2, lower alkyl or lower alkoxy radicals containing from 1 ...	03/08/1977
4009008	Colored water immiscible organic liquid Novel disazo colorants or dyes for marking organic liquids, the colorants having the general formula ##STR1## where R1 is H, CF3, or alkyl having from 1 to 4 carbon atoms, R2 is H, or alkyl having from 1 to 4 carbon atoms,...	02/22/1977
4000985	Azo dyes having a high solubility in petroleum fuels Azo dyes which are highly soluble in petroleum fuels. The dyes have the general formula ##STR1## where R1, R.sub. 2, R.sub. 3, and R4 are each H or CH.sub. 3 and R.sub. 5 is either 2-ethylhexyl or 2-ethylhexyloxypropyl. When R.s...	01/04/1977
3964294	Technique and system for coding and identifying materials Microencapsulated spheroids containing a coded, volatile electron absorbing substance are dispersed into a material to be regulated such as crude oil in a tanker. Samples of the material such as an oil spill are collected and the source of the material is...	06/22/1976

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Class 44/328 - Azo compound (i.e., each of the nitrogens is single bonded to carbon)