Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7371906 | Process for photo-oxidative stability improvements A process for improving the stability to photo-oxidation of a polycyclic aromatic compound having at least two polymorphic forms comprises treating a first polymorph with one or more solvents to obtain the more stable second polymorph and then separating the second ... | 05/13/2008 |
| 7311807 | Process for the separation of mixtures containing m-and p-dichlorobenzene A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which: (i) the mixture is as an extracting agent contacted with a phosphoric ester of the general formula (I) as an extracting agent | 12/25/2007 |
| 7205438 | Solvent recovery blends from diene production A diene production stream comprising a solvent recovery blend from diene production comprising one or more fouling agent, one or more extractive distillation solvent, and from about 1 ppm to about 1000 ppm of N,N-disubstituted amide. ... | 04/17/2007 |
| 7182839 | Preventing deposition of fouling agents onto equipment Methods and compositions effective to prevent deposition of fouling agents, preferably polymerization precursors, on handling equipment, particularly during solvent recovery. ... | 02/27/2007 |
| 7157611 | Pyrazinoporphyrazines as markers for liquid hydrocarbons 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. ... | 01/02/2007 |
| 7125475 | Nitrosophenols and C-nitrosoanilines as polymerization inhibitors Inhibitor blends that include both nitrosophenols and nitrosoanilines, optionally in combination with air or oxygen, reduce the premature polymerization of ethylenically unsaturated monomers. unsaturated monomers. ... | 10/24/2006 |
| 7045647 | Blends of quinone alkide and nitroxyl compounds and polymerization inhibitors Disclosed herein is a method for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers an effective amount of: A) at least one nitroxyl compound, and B) at least one quinone alkide compound having an electro... | 05/16/2006 |
| 6918958 | Acid pigment dispersants and pigment preparations The invention relates to pigment dispersants of the formula (I), and to pigment preparations including at least one organic pigment and at least one pigment disperant of the formula (I): wherein Q1, R1 | 07/19/2005 |
| 6841061 | Antigelling agent for hydrocarbon mixture containing conjugated diene and method of preventing clogging of apparatus for separating and purifying the mixture An Anti-gelling agent for a hydrocarbon mixture containing a conjugated diene, which comprises (a) at least one compound selected from the group consisting of compounds having an NO radical in the molecule, and precursor compounds capable of forming an NO radical, (... | 01/11/2005 |
| 6835288 | Method for preventing undesired polymerization in a mixture of substances containing ethylenically unsaturated compounds A process for preventing undesired polymerization is conducted by maintaining an effective concentration of a stabilizer which comprises N-oxyl radicals in a mixture containing ethylenically unsaturated compounds, wherein (i) an el... | 12/28/2004 |
| 6833484 | Inhibiting oxidation of a Fischer-Tropsch product using petroleum-derived products The present invention relates blended hydrocarbonaceous products comprising Fischer Tropsch derived products that resist oxidation and to methods of inhibiting oxidation in Fischer Tropsch products. The present invention also relates to Fischer Tropsch products cont... | 12/21/2004 |
| 6761833 | Stabilization of monomers by compositions based on alkylhydroxylamines Vinyl monomers are stabilized by a composition which includes an alkyl hydroxyl amine and a sulfide compound or at least two alkyl hydroxyl amines and a phenolic compound. ... | 07/13/2004 |
| 6717021 | Solvating component and solvent system for mesophase pitch A solvating component for a solvated mesophase pitch. The solvated component includes a mixture of aromatic hydrocarbons having boiling points in the atmospheric equivalent boiling point range of about 285° to about 500° C. (about 550° F.-932° F.). At least 80% ... | 04/06/2004 |
| 6660181 | Inhibition of polymerization of unsaturated monomers A method is disclosed for inhibiting the premature polymerization of ethylenically unsaturated monomers comprising adding to said monomers a polymerization inhibiting amount of a mixture comprising A) a first inhibitor comprising 4-amino-2,2,6,6-tetramethy... | 12/09/2003 |
| 6596911 | Composition and method for inhibition of formation of gas hydrates A method and a composition used therein are disclosed for inhibiting formation of hydrocarbon hydrates. The composition comprises an onium compound, an amine salt and, optionally, a solvent. The method and composition are particularly useful for oil and g... | 07/22/2003 |
| 6579442 | Methods and compositions for inhibiting polymerization of vinyl monomers Methods and compositions for inhibiting the polymerization of vinyl monomers are disclosed. Combinations of nitroxyl compounds and aliphatic amines are effective at inhibiting the polymerization of vinyl monomers under both processing and storage conditio... | 06/17/2003 |
| 6545156 | Oligomeric hindered amine light stabilizers based on multi-functional carbonyl compounds and methods of making same Oligomeric compounds and methods of making the compounds having the formula: T.paren open-st.M--F.paren close-st.i.paren open-st.M--F'.paren close-st.j M (III) wherein i and j are integers from about 0 to 300 and the sum of i and j is ... | 04/08/2003 |
| 6506806 | Reduction of surface tension A composition for reducing surface tension comprising from about 0.1% to about 0.5% by weight of a hydrocarbon surfactant and from 0.0001% to about 0.3% by weight of a fluorocarbon surfactant, provided that the hydrocarbon surfactant is present at less th... | 01/14/2003 |
| 6475348 | Mixture of substances containing compounds with vinyl groups and stabilizers A mixture contains one or more vinyl-containing compounds as component (A) and, as a further component, a stabilizer (B) which contains one or more readily volatile nitroxyl compounds as component (b1), one or more sparingly volatile nitroxyl c... | 11/05/2002 |
| 6409887 | Polymerization inhibitor A monomer composition, stabilized against premature polymerization, comprising: a) an ethylenically unsaturated monomer or mixture of monomers polymerizable by free radical initiation, and b) an effective amount, sufficient to inhibit premature polymeriza... | 06/25/2002 |
| 6395943 | Process for inhibiting the polymerization of vinyl aromatic compounds A process is disclosed for inhibiting the polymerization of vinyl aromatic compounds, such as styrene, during its distillation. The process involves adding a mixture of at least two inhibitors to the vinyl aromatic compound. One such combination is N... | 05/28/2002 |
| 6395942 | Increasing the thermal stability of a vinyl aromatic polymerization inhibitor Compounds that inhibit polymerization of vinyl aromatic compounds need to operate at temperatures of about 90° C. to about 150° C. A process for increasing the thermal stability of inhibitors such as N,N'-di-2-butyl-N,N'-dinitroso-1,4-diaminobenzene is ... | 05/28/2002 |
| 6379588 | Stabilized monomer composition A monomer composition, which contains A) vinyl-containing monomers in which a heteroatom selected from the group consisting of the halogens, nitrogen, oxygen, sulfur and silicon is present on the vinyl group, and B) a compound or a mixture of compounds of the ... | 04/30/2002 |
| 6342648 | Methods and compositions for inhibiting vinyl aromatic monomer polymerization The present invention provides compositions and methods inhibiting polymerization of vinyl aromatic compounds comprising a bisphenol compound and an oxidized p-phenylenediamine. In a specific, non-limiting embodiment, the polymerization of the vinyl aroma... | 01/29/2002 |
| 6342647 | Vinyl monomer polymerization inhibition using hindered hydroxylamines It has been discovered that the polymerization of vinyl aromatic compounds, such as styrene, may be inhibited by the addition of a composition that contains a hindered hydroxylamine, and, optionally, a synergist together with the hindered hydroxylamine. I... | 01/29/2002 |
| 6339051 | Diesel engine cylinder oils Diesel engine cylinder oils of improved cleanliness and load carrying ability and reduced port deposit characteristics for use in marine and stationary slow speed diesel engines are based on medium heavy Group I or Group II neutral base oils, typically fr... | 01/15/2002 |
| 6284936 | Styrene monomer polymerization inhibition using substituted dihydroxyarenes and nitroxides It has been discovered that the polymerization of vinyl aromatic compounds, such as styrene, may be inhibited by the addition of a composition that contains an alkyl-dihydroxyarene, a hydrogen transfer agent, and a stable nitroxide. In another, preferred ... | 09/04/2001 |
| 6262323 | Polymerization inhibition of isoprene It has been discovered that the polymerization of diene compounds, such as isoprene, may be inhibited by the addition of a composition that contains a at least one phenylenediamine, at least one sterically hindered phenol, and at least one hydroxylamine. ... | 07/17/2001 |
| 6231662 | Surface treatments for titanium dioxide and other industrial pigments An additive for enhancing the performance of industrial pigments. The additive improves dispersibility and is the reaction product of an amine, a fatty amine, and a polybasic acid.... | 05/15/2001 |
| 6204420 | Synergistic mixtures of phosphoric esters with carboxylic acids or carboxylic acid derivatives as asphaltene dispersants The invention relates to a synergistic mixture of A from 5 to 99% by weight of a carboxylic acid having more than 4 carbon atoms, an ethercarboxylic acid containing C18 -C22 -alkyl, C18 -C22 -alkenyl or C6... | 03/20/2001 |
| 6200460 | Substance mixtures containing stabilizers and compounds containing vinyl groups Substance mixtures comprising (A) vinyl-containing compounds, (B) an active amount of a mixture inhibiting the premature polymerization of the vinyl-containing compounds, comprising (i) at least one N-oxyl compound of a secondary amine which carries no hydroge... | 03/13/2001 |
| 6143205 | Mixtures containing monomers and stabilizers Mixtures contain (A) vinyl-containing monomers, and (B) an effective amount of a mixture inhibiting the premature polymerization of the vinyl-containing monomers during the purification or distillation and containing (i) from 0.05 to 4.5% by weight, based on t... | 11/07/2000 |
| 6024894 | Compositions and methods for inhibiting vinyl aromatic monomer polymerization Synergistic composition and method of use are disclosed. The compositions comprise a quinone methide derivative and a hydroxylamine compound. These compositions demonstrate synergism at inhibiting the polymerization of a vinyl aromatic monomer. Preferably... | 02/15/2000 |
| 6004361 | Low emissions diesel fuel A low emission diesel fuel suitable for use in underground diesel-engined mining equipment comprises a straight run distillate fuel having an end point not greater than 300° C. (about 660° F.), a cetane number in the range of 55 to 60 a specific gravity... | 12/21/1999 |
| 5990327 | Use of aminotriarylmethanes for marking hydrocarbons and novel aminotriarylmethanes Use of aminotriarylmethanes of the formula ##STR1## where the ring A may be benzofused, and R1 and R2 are each substituted or unsubstituted C1 -C13 -alkyl or substituted or unsubstituted phenyl, or R1... | 11/23/1999 |
| 5976201 | Low emissions diesel fuel A low emission diesel fuel suitable for use in underground diesel-engined mining equipment comprises a straight run distillate fuel having an end point not greater than 300° C. (about 660° F.), a cetane number in the range of 55 to 60 a specific gravity... | 11/02/1999 |
| 5910232 | Method for inhibiting polymer formation in styrene processing Inhibition performance is improved in styrene processing through the addition of a stable nitroxide free radical compound to the styrene feed and to the reflux of at least one column.... | 06/08/1999 |
| 5869717 | Process for inhibiting the polymerization of vinyl aromatics Applicants have developed a process for inhibiting the polymerization of vinyl aromatic compound during the distillation of the vinyl aromatic compounds. The process involves adding to the vinyl aromatic compound, e.g., styrene, a nitroso compound such as... | 02/09/1999 |
| 5841010 | Surface active agents as gas hydrate inhibitors This invention is directed toward a method for inhibiting the formation (nucleation, growth and agglomeration) of clathrate hydrates. The method comprises adding into a mixture comprising hydrate forming substituents and water, an effective amount of a hy... | 11/24/1998 |
| 5824829 | Hydrocarbon viscosity inhibitor and inhibiting method An inhibitor to suppress or inhibit the viscosity increase of a hydrocarbon, e.g. in a bottom section of an oil quench tower, featuring the use of a sulfonic acid and/or its salt as an effective inhibitor composition, which may optionally contain a polyme... | 10/20/1998 |
