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| Number | Title | Issue Date |
| 6532642 | Method of making a silicon carbide rail for use in a semiconductor wafer carrier A silicon carbide rail for use as a support in an apparatus for holding semiconductor wafers is made by forming a first series of parallel slots or grooves into the front side of a graphite plate usually without piercing the back side of the plate, conver... | 03/18/2003 |
| 4950552 | Method for protecting stainless steel pipe and the like in geothermal brine service from stress corrosion cracking, and articles made thereby A method is provided for protecting flow-conducting elements, such as pipe, fittings, valves, and vessels which are constructed of austenitic and duplex stainless steel alloy materials and which are used in hot geothermal brine service from stress crackin... | 08/21/1990 |
| 4942254 | Methods for acid catalyzed reactions Compositions containing sulfuric acid and one or more of certain chalcogen-containing compounds in which the chalcogen compound/H2 SO4 molar ratio is below 2 contain the mono-adduct of sulfuric acid which is catalytically active for ... | 07/17/1990 |
| 4939200 | Fast curing binder for cellulose Non-formaldehyde emitting binders for nonwoven cellulosic materials comprise a solution copolymer of an olefinically unsaturated organic compound having at least one carboxylate group, which is reacted with a primary or secondary amide of an olefinically ... | 07/03/1990 |
| 4935048 | Cellulosic compositions and methods for treating cellulosic materials Cellulosic materials are physically and/or chemically modified by contact with a combination of urea and sulfuric acid in which at least 25 percent of the sulfuric acid is present as the monourea adduct of sulfuric acid. The cellulosic materials thus trea... | 06/19/1990 |
| 4931061 | Plant seed compositions Plant seeds are beneficiated by contacting them with an aqueous solution of a urea-sulfuric acid component containing the monourea adduct of sulfuric acid. The molar ratio of urea to sulfuric acid in the aqueous solution is preferably within the range of ... | 06/05/1990 |
| 4931079 | Scarifying plant seeds Plant seeds are beneficiated by contacting them with an aqueous solution of a urea-sulfuric acid component containing the monourea adduct of sulfuric acid. The molar ratio of urea to sulfuric acid in the aqueous solution is preferably within the range of ... | 06/05/1990 |
| 4924942 | Well forming process A thixotropic preflush fluid is employed in a well drilling operation to prevent loss of cement slurry to an air zone penetrated during the drilling operation. The preflush fluid comprises water, a cement, calcium sulfate, and a quick-hardening accelerato... | 05/15/1990 |
| 4923009 | Steam enhanced oil recovery processes and compositions for use therein A composition for use in enhanced oil recovery procedures comprises steam having a vapor phase and a liquid phase and a fluorocarbon surfactant partitioned between the liquid and vapor phases. The partitioning of the fluorocarbon surfactant between the tw... | 05/08/1990 |
| 4915843 | Continuous displacement chromatographic method Chromatographic species are continuously separated by displacement chromatography using an apparatus that comprises an inlet distribution manifold, a particulate bed, and a plurality of collector receptacles. The particulate bed is moved with respect to t... | 04/10/1990 |
| 4912278 | Friedel-Crafts reactions Compositions containing sulfuric acid and one or more of certain chalcogen-containing compounds in which the chalcogen compound/H2 SO4 molar ratio is below 2 contain the mono-adduct of sulfuric acid which is catalytically active for ... | 03/27/1990 |
| 4910356 | Acid catalyzed reduction Compositions containing sulfuric acid and one or more of certain chalcogen-containing compounds in which the chalcogen compound/H2 SO4 molar ratio is below 2 contain the mono-adduct of sulfuric acid which is catalytically active for ... | 03/20/1990 |
| 4910179 | ID catalyzed reactions and compositions for use therein Certain urea-sulfuric acid components, comprised of urea and sulfuric acid in a 1/4 to 7/4 molar ratio, contain a monourea adduct of sulfuric acid, which is catalytically active for promoting organic chemical reactions. The invention provides methods empl... | 03/20/1990 |
| 4909945 | Method for increasing the size of elemental sulfur particles produced by a hydrogen sulfide removal process A method is provided for removing elemental sulfur particles from a hydrogen sulfide removal process which employs a regenerable, aqueous washing solution capable of absorbing hydrogen sulfide from an industrial gas stream and converting that hydrogen sul... | 03/20/1990 |
| 4910330 | Synthesis of sulfonic acids and carboxylic acid ester derivatives thereof Hydroxy sulfonic acids in general and isethionic acid (2-hydroxy ethyl sulfonic acid) in particular can be prepared at 99+% purity and good yields by the selective oxidation of a precursor hydroxy mercaptan with hydrogen peroxide. The resulting product is... | 03/20/1990 |
| 4908143 | Lubricating compositions and method of using same Additives comprising a salt or complex of tetrathiocarbonic acid are useful in lubricants to enhance both the extreme pressure/anti-wear and anti-oxidant capabilities thereof. The lubricants preferably are oils of lubricating viscosity, which may be thick... | 03/13/1990 |
| 4908142 | Extreme pressure lubricating compositions and method of using same Additives containing a salt or complex of trithiocarbonic acid are useful in lubricants to enhance the extreme pressure/anti-wear and anti-oxidation capabilities thereof. The lubricants are preferably oils of lubricating viscosity, which may be thickened ... | 03/13/1990 |
| 4904279 | Hydrocarbon fuel composition containing carbonate additive Hydrocarbon fuels heavier than gasoline, especially diesel fuel compositions, contain carbonate additives, preferably non-aromatic, metals-free carbonates, to reduce particulate emissions therefrom when combusted in an internal combustion engine.... | 02/27/1990 |
| 4892723 | Method for improving the long-term stability of H2 S absorption-oxidation process solutions The long term stability of process solutions used in H2 S-to-sulfur absorption/oxidation process, wherein the incoming hydrogen sulfide-containing gas stream is contaminated with hydrocarbons and/or organic oxygenated compounds and the process ... | 01/09/1990 |
| 4891049 | Hydrocarbon fuel composition containing carbonate additive Hydrocarbon fuels heavier than gasoline, especially diesel fuel compositions, contain carbonate additives, preferably non-aromatic, metals-free carbonates, to reduce particulate emissions therefrom when combusted in an internal combustion engine.... | 01/02/1990 |
| 4885425 | Alkylation Compositions containing sulfuric acid and one or more of certain chalcogen-containing compounds in which the chalcogen compound/H2 SO4 molar ratio is below 2 contain the mono-adduct of sulfuric acid which is catalytically active for ... | 12/05/1989 |
| 4829102 | Polymeric opaque particles and process for making same Polymer opaque particles and a process for making same are disclosed. These particles comprise an emulsion polymerized core copolymer having, as one constituent thereof, between about 15% and about 40% by weight of a monomer having the general formula: ... | 05/09/1989 |
| 4555584 | Process for producing conjugated dienes Large surface area oxidative dehydrogenation catalysts which are suitable for converting C4 to C8 mono-olefins to conjugated dienes are disclosed, comprising the oxides of vanadium, phosphorus, tin and potassium in combination with h... | 11/26/1985 |
| 4508537 | Method for removing elemental sulfur particles from the aqueous washing solution of a hydrogen sulfide removal process A method is provided for removing elemental sulfur particles from a hydrogen sulfide removal process which employs a regenerable, aqueous washing solution capable of absorbing hydrogen sulfide from an industrial gas stream and converting that hydrogen sul... | 04/02/1985 |
| 4496534 | Method for reconditioning bacteria-contaminated hydrogen sulfide removing systems A method is provided for reconditioning a hydrogen sulfide removal system, such as a Stretford process system in which elemental sulfur is formed, after the system has become contaminated with sulfur-feeding bacteria to an extent that operation thereof is... | 01/29/1985 |
| 4469612 | Agglomeration of mineral-derived fines Mineral-derived fines are contacted with a polymeric material to agglomerate the fines. The agglomerating polymeric materials are the homopolymers and salts of homopolymers of acrylic acid and methacrylic acid, the copolymers and salts of copolymers of ac... | 09/04/1984 |
| 4446036 | Process for enhanced oil recovery employing petroleum sulfonate blends Enhanced oil recovery from a subterranean petroleum reservoir is realized by successively flooding oil-bearing subterranean formations with (1) a micellar displacement fluid comprising a hydrocarbon, cosurfactant, brine and two or more different petroleum... | 05/01/1984 |
| 4446001 | Recovery of retorted shale from an oil shale retorting process Retorted shale particles are recovered from a retort and delivered to a gas lift for transport to a fluidized combustor by passage, serially, through a sealing vessel, a crusher preferably operating at retort pressure, and a surge vessel. In the sealing v... | 05/01/1984 |
| 4435271 | Oil shale retorting process with a moving bed pressure letdown stage A dry sealing leg apparatus is comprised of four chambers through which a moving bed of retorted shale particulates from an oil shale retort is passed serially: a surge chamber, a gas injection chamber, a seal leg chamber, and a gas disengaging chamber. I... | 03/06/1984 |
| 4432962 | Method for removing hydrogen sulfide from gas streams A hydrogen sulfide removal and conversion method in which a hydrogen sulfide-containing gas stream is contacted with a regenerable washing solution having a pH between about 5 and about 10 and containing solubilized vanadium, thiocyanate ions, a carboxyla... | 02/21/1984 |
| 4431526 | Multiple-stage hydroprocessing of hydrocarbon oil In the catalytic hydroprocessing of hydrocarbons, a hydrocarbon oil is successively contacted with a first hydroprocessing catalyst in a first reaction zone and a second hydroprocessing catalyst in a second reaction zone. The first catalyst has an average... | 02/14/1984 |
| 4425221 | Hydrocarbon desulfurization process with a catalyst of Co-Mo-P A hydrocarbon conversion catalyst containing cobalt and a Group VIB metal and having a substantially uniform crosssectional phosphorus distribution is prepared by impregnating support particles with a solution containing dissolved cobalt, phosphorus, and ... | 01/10/1984 |
| 4420938 | Geothermal power plant Useful energy is derived from steam flashed from hot geothermal brine having a tendency to deposit amorphous silica or calcite upon a reduction in the pressure or temperature of the brine. Steam condensate produced from the flashed steam is pressurized, a... | 12/20/1983 |
| 4419224 | Desulfurization of hydrocarbons A hydrocarbon feedstock containing organo-sulfur compounds, such as a naphtha containing mercaptans, is desulfurized by contact, under non-hydrogenative conditions, with a reduced catalytic absorbent comprising one or more nickel components and one or mor... | 12/06/1983 |
| 4414104 | Process for removal of metals from hydrocarbon oils A thiocyanate compound is added to metals-containing hydrocarbon oils under reaction conditions, and a product hydrocarbon of reduced metals content is separated from a metals-containing solid.... | 11/08/1983 |
| 4393936 | Method for the enhanced recovery of oil and natural gas A method for the enhanced recovery of both natural gas and liquid petroleum from hydrocarbon-containing subterranean formations, particularly dipping subterranean formations, by the consecutive steps of introducing a gaseous displacement fluid to recover ... | 07/19/1983 |
| 4394302 | Hydrodesulfurization catalyst on lithium-containing support and method for its preparation The porosity and surface area of refractory oxides are modified by adding a lithium component thereto and then calcining. The resultant material, having a lower surface area, a lower total pore volume, and a larger average pore diameter in comparison to t... | 07/19/1983 |
| 4393037 | Method for reconditioning bacteria-contaminated hydrogen sulfide removing systems A method is provided for reconditioning a hydrogen sulfide removal system, such as a Stretford process system in which elemental sulfur is formed, after the system has become contaminated with sulfur-feeding bacteria to an extent that operation thereof is... | 07/12/1983 |
| 4392985 | Hydrocarbon conversion catalyst and method of preparation A hydrocarbon conversion catalyst containing cobalt and a Group VIB metal and having a substantially uniform cross-sectional phosphorus distribution is prepared by impregnating support particles with a solution containing dissolved cobalt, phosphorus, and... | 07/12/1983 |
| 4391329 | Use of marker fluid in cementing offshore wells Cementing casing in an offshore well by displacing a drilling fluid with a settable cement slurry wherein there is injected into the annulus between the sidewall of the well and the casing ahead of the cement slurry a slug of a visually identifiable marke... | 07/05/1983 |
