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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 5573725 | Corrosion inhibition system featuring the reaction product of a polythioether polyol and fatty acid A series of water-dispersible and oil-dispersible corrosion inhibiting solutions are disclosed which comprise about 10 ppm by volume to about 5% by volume of an acid catalyzed condensation reaction product of a fatty acid and a polythioether polyol repres... | 11/12/1996 |
| 5205925 | Recovering polychlorinated biphenyls from solution A method of recovering polychlorinated biphenyls by mixing and reacting a soluble polymer with polychlorinated biphenyls in non-aqueous solvent to form a precipitate reaction complex of the polymer and biphenyl, and separating the precipitate from the sol... | 04/27/1993 |
| 5169559 | Method for forming a high viscosity gel The invention is a method for forming a high viscosity gel by mixing about 0.9% to about 3.0% by weight of hydroxy propyl cellulose having an average molecular weight greater than about 1,000,000 about 0.4% to about 3.0% by weight of an alkali metal dodec... | 12/08/1992 |
| 5167281 | Dialkylate additives for surfactant sytems The invention is a method of moving hydrocarbons through an underground formation for later recovery which comprises injecting an aqueous surfactant system having about 0.5% to about 10% of one or more surfactants and about 0.5% to about 10% of an alkoxyl... | 12/01/1992 |
| 5141713 | Apparatus for continuous recovery of certain elements from a combustible liquid A combustion apparatus for continuously obtaining a sample of a preselected trace element contained in a combustible liquid comprising a combustion chamber having inlets for combustible liquid and oxygen, an outlet for gaseous combustion products and a co... | 08/25/1992 |
| 5141536 | Glycol dehydration apparatus for natural gas An improved glycol dehydration apparatus with a condenser on the reboiler water vapor vent to condense volatile carbon compounds, said condenser comprising a countercurrent flow shell-and-tube condenser with an annular space of at least three-quarters of ... | 08/25/1992 |
| 5100567 | Shear-thickening solutions with hydroxypropyl cellulose The invention is an aqueous shear-thickening composition comprising in one embodiment about 0.2% to about 1% by weight of hydroxypropyl cellulose having an average molecular weight between about 1,000,000 and about 1,300,000, about 0.1% to about 0.7% by w... | 03/31/1992 |
| 5098844 | Method for isolating palynological material from a rock sample in a pressurized reaction cell The invention is a method for the isolation of palynological materials from a rock sample in a pressurized reaction cell, which permits reaction at pressures greater than two atmospheres and provides for the removal of all liquids from the cell without si... | 03/24/1992 |
| 5095986 | Enhanced oil recovery using oil soluble sulfonates from lignin and benzyl alcohol The invention is a method of producing oil soluble surfactants from lignin which comprises reacting benzyl alcohol with lignin phenol at elevated temperature in the presence of a non-nucleophilic basic catalyst to produce a lignin phenol reaction product,... | 03/17/1992 |
| 5095989 | Microemulsion method for improving the injectivity of a well A method for improving the injectivity of an injection well for water or gas injection into an underground hydrocarbon formation which comprises injecting into the formation through an injection well a sufficient amount of a solvent-in-water microemulsion... | 03/17/1992 |
| 5095985 | Enhance oil recovery using oil soluble sulfonate surfactants from lignin and alkylphenol The invention is a method of producing oil soluble surfactants from lignin which comprises reacting an alkylphenol having an alkyl chain of about 5 to about 20 carbon atoms with formaldehyde at elevated temperature to produce an intermediate product and r... | 03/17/1992 |
| 5094295 | Enhanced oil recovery using alkylated, sulfonated, oxidized lignin surfactants The invention is a method of producing water soluble surfactants from lignin, which comprises alkylating lignin at phenolic oxygen sites with an alkyl chain having about 3 to about 24 carbon atoms, sulfonating the alkylated lignin, and oxidizing the alkyl... | 03/10/1992 |
| 5094296 | Lignin amine microemulsions The invention is a method of recovering hydrocarbons from an underground hydrocarbon formation having at least one injecting well and at least one production well which comprises injecting a microemulsion into the formation through an injection well, driv... | 03/10/1992 |
| 5092405 | Alkoxylated surfactant system for heavy oil reservoirs The invention is a method of recovering heavy oil from an underground reservoir by surfactant flooding which comprises injecting an aqueous surfactant solution comprising about 0.1% to about 5% by weight of an alkoxylated nonionic or ionic surfactant thro... | 03/03/1992 |
| 5083612 | Hot water, surfactant, and polymer flooding process for heavy oil Injection of steam or other thermal fluid for recovery of heavy crude oil is accompanied by or followed by injection in the same well of a solution of petrochemical sulfonate and a co-surfactant, the co-surfactant being either an olefin sulfonate or a pro... | 01/28/1992 |
| 5076361 | Gel method for decreasing permeability around a wellbore The invention is a method for decreasing formation permeability in an underground formation around a wellbore by injecting an aqueous fresh water solution comprising about 0.9% to about 3.0% by weight of hydroxy propyl cellulose having an average molecula... | 12/31/1991 |
| 5065821 | Gas flooding with horizontal and vertical wells The invention is a method of producing hydrocarbons from a region bounded by two vertical wells and a horizontal well, which comprises injecting a gas through a first vertical well, concurrently performing a cyclic injection, soak and production of gas th... | 11/19/1991 |
| 5035288 | Lignin phenol/lignin/amine surfactant system The invention is a method of recovering hydrocarbons from an underground hydrocarbon formation penetrated by at least one injection well and at least one production well, which comprises injecting into an underground formation through an injection well ab... | 07/30/1991 |
| 5033547 | Method for decreasing mobility of dense carbon dioxide in subterranean formations Oil recovery by carbon dioxide flooding is increased by adding surfactants to the carbon dioxide at high pressures such that an emulsion with water will be formed in the pore spaces of rock. The emulsion diverts flow of carbon dioxide to rock containing h... | 07/23/1991 |
| 5027898 | Foaming agents for carbon dioxide and steam floods The invention is a foam method for improving conformance during a steam flood or carbon dioxide flood in an underground hydrocarbon formation penetrated by at least one injection well and at least one production well, which comprises injecting into an inj... | 07/02/1991 |
| 5009268 | Method of using a combination lignosulfonate/polyalkylene glycol system as a sacrificial agent for surfactant flooding A sacrificial agent solution which is compatible with high molecular weight mobility control polymers for enhanced oil recovery, said solution comprising about 0.1% to about 5% by weight of a lignosulfonate and about 0.01% to about 5% by weight of a polya... | 04/23/1991 |
| 4990773 | Method for determining the producibility of a hydrocarbon formation The invention is a method of evaluating a sample of an underground formation such as drill cuttings to determine the producibility of any hydrocarbons present in the formation by solvating a sample in a polar solvent which will solvate asphaltenes, solvat... | 02/05/1991 |
| 4982789 | Method of using urea as a sacrificial agent for surfactants in enhanced oil recovery The disclosed invention is a method of injecting a solution or emulsion containing about 0.05% to about 10% by weight of urea as a sacrificial agent for surfactants into an underground formation in enhanced oil recovery operations, said underground format... | 01/08/1991 |
| 4982052 | Separation of a mixture of normal paraffins branched chain paraffins and cyclic paraffins The invention is a process for separating a mixture of saturated hydrocarbons into normal paraffins, branched chain paraffins, and cyclic paraffins which comprises contacting said mixture with a series of two molecular sieves comprising a first silicalite... | 01/01/1991 |
| 4976315 | Use of taurine additives in enhanced oil recovery with anionic surfactants A method is disclosed for increasing the recovery of oil in enhanced oil recovery operations employing anionic surfactant by blending a taurine with said anionic surfactant. The taurine may also increase the salt and divalent ion tolerance of the anionic ... | 12/11/1990 |
| 4977319 | Method for determining oil content of an underground formation The invention is a method of evaluating a sample of an underground formation to determine the hydrocarbon content of any hydrocarbons present in the formation. It involves the steps of solvating a known volume of a sample in a known volume of a solvent wh... | 12/11/1990 |
| 4971707 | Method of producing oil-in-water microemulsions A method for producing a homogeneous oil-in-water microemulsion by first creating a surfactant, oil and water mixture, adding salt to the mixture in a sufficient quantity to drive the mixture into a Type III or Type II(+) phase regime, preparing a solutio... | 11/20/1990 |
| 4964465 | Method employing liquidized sand for controlling lost circulation of drilling fluids The disclosed invention is a method for reducing lost circulation in wellbores. In the method, a liquidized sand, comprised of a particulate material, a resin, and a carrier fluid comprising a surfactant mixed with air, is injected into the wellbore. The ... | 10/23/1990 |
| 4961758 | Liquid membrane process for separating gases The invention is a liquid membrane process for separating a gaseous stream into a permeate stream of gases having predominantly lower equilibrium K values and a stream of gases having predominantly higher equilibrum K values, wherein the feed stream and t... | 10/09/1990 |
| 4957163 | Method of stabilizing polymer solutions in a subterranean formation Petroleum is extracted from a subterranean reservoir by injecting into injection wells an aqueous polymer solution wherein the polymer is stabilized against viscosity deterioration by treating the reservoir with an effective amount of urea in an aqueous s... | 09/18/1990 |
| 4950474 | Combination corrosion and scale inhibiting system containing phosphonate/amine reaction product A series of water-dispersible corrosion and scale inhibiting solutions are disclosed which contain the reaction product of a phosphonate compound containing at least two phosphonate groups of the formula ##STR1## and an ethoxylated, propoxylated alky... | 08/21/1990 |
| 4946606 | Producing oil-in-water microemulsions from a microemulsion concentrate The invention is a method of producing a homogeneous oil-in-water microemulsion comprised of oil, brine and surfactant, wherein the oil has a equivalent alkane carbon number higher than the crude oil which is to be recovered by the microemulsion. A mixtur... | 08/07/1990 |
| 4905510 | Method of isolating an oilfield flowline sample for analysis without shearing the sample The invention is a method for isolating a sample of oilfield production without shearing the sample, which includes a multistep method of using a chamber to isolate a sample of fluid from a flowline by transferring the sample from the flowline without a s... | 03/06/1990 |
| 4887671 | Fracturing with a mixture of carbon dioxide and alcohol The invention is a method of fracturing an underground formation penetrated by a wellbore, which comprises injecting into a formation a mixture of carbon dioxide and a polar alcohol or polar glycol additive at a temperature and pressure above the critical... | 12/19/1989 |
| 4884635 | Enhanced oil recovery with a mixture of water and aromatic hydrocarbons The invention is a method of recovering hydrocarbons from underground hydrocarbon formations penetrated by at least one injection well and at least one production well, which comprises injecting into the formation a mixture of hot water and about 0.1% to ... | 12/05/1989 |
