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| Number | Title | Issue Date |
| 4548707 | Use of high ethoxylate low carbon atom amines for simultaneous removal of sulfonate surfactants and water from recovered crude oil This invention relates to secondary or tertiary recovery processes for the recovery of oil from subterranean oil-bearing reservoirs. More particularly, this invention relates to an improved method for the recovery of petroleum from underground reservoirs,... | 10/22/1985 |
| 4440869 | Olefin polymerization catalyst High activity catalysts for the polymerization of ethylene and other -olefins are made by contacting a soluble magnesium compound of the general formula Mg(OSiR3)2, wherein each R is, independently, alkyl, alkoxy or aryl, with... | 04/03/1984 |
| 4435606 | Process for the preparation of linear olefins from triethylaluminum and tripropylaluminum via growth, isomerization and metathesis Internal olefins are subjected to metathesis closely coupled after an isomerization reaction to obtain desired molecular weight range linear olefins. Specific process steps and separation conditions are necessary to obtain the desired linear olefins.... | 03/06/1984 |
| 4435295 | Sulfonate for waterflooding An improved sulfonate suitable for waterflooding is formed by sulfonating a blend of two alkyl aromatic feedstocks, one being a high molecular weight monoalkylbenzene while the second is a mixture of normal alkyl aromatic compounds such as monoalkyl benze... | 03/06/1984 |
| 4433123 | Polymerization process for drag reducing substances A method is provided for the production of ultrahigh molecular weight drag reducing substances and the like comprising: (a) preparing under an inert atmosphere a catalyst comprising: p1 (1) titanium halide of the general formula TiXm wherein m=2.5 t... | 02/21/1984 |
| 4424308 | Preparation of modified aromatic-moiety-containing polymers A process for preparing aromatic-moiety-containing polymers having modified physical properties is disclosed. Briefly, the process comprises reacting in the presence of a Friedel-Crafts catalyst: (a) a suitable aromatic-moiety containing polymer resin and... | 01/03/1984 |
| 4423238 | Process for purifying acetals A method of purifying trioxane and other acetals by contacting them with an alkali metal and a phase transfer catalyst is described. Trioxane so purified is capable of being polymerized to high molecular weight.... | 12/27/1983 |
| 4418005 | Pressure activation of magnesium oxide catalysts A titanium oxide/magnesium sulfate/magnesium oxide catalyst which is an ortho-selective methylation catalyst can be made to exhibit higher conversion and activity index for phenol methylation by the application of pressure. The pressure can be applied thr... | 11/29/1983 |
| 4415714 | Catalyst and method for preparation of drag reducing substances A method is provided for the production of ultrahigh molecular weight drag reducing substances and the like comprising: (a) preparing under an inert atmosphere a catalyst comprising: (1) titanium halide of the general formula TiXm wherein m=2.5 to 4.0 and X is... | 11/15/1983 |
| 4414136 | Catalysts for ethylene oxychlorination Highly active, improved ethylene oxychlorination catalysts are prepared by forming alumina having specific pore volume characteristics and impregnating such alumina with an oxychlorination catalyst such as CuCl2. The improved catalysts of the p... | 11/08/1983 |
| 4412065 | Poly(oxy(silylene) esters) The present invention describes novel hydrocarbon-insoluble poly-silyl esters and a method for forming these compounds utilizing carboxylic acid salts with silicon reagents in the presence of phase transfer catalysts.... | 10/25/1983 |
| 4405819 | Process for the production of alcohols from carboxylic acids An improved process is provided for the production of alcohols from carboxylic acids using the reaction of carboxylic acids with alcohols in the presence of hydrogen and carbon monoxide to form esters which are subsequently hydrogenated over a suitable hy... | 09/20/1983 |
| 4397764 | Polymer-supported ethylene polymerization catalyst A polymer-supported ethylene polymerization catalyst prepared by a method comprising (a) a polymer supported titanium-based catalyst consisting of (1) a polymer resin containing an amino borane reducing agent; (2) a titanium tetrahalide; (3) and a suitable organome... | 08/09/1983 |
| 4380610 | Polyacetal comb polymers This invention relates to "comb" polymers having high molecular weight and related structurally to polyoxymethylene, but having improved thermal stability. In addition, this invention relates to a method for preparing these high molecular weight "comb" po... | 04/19/1983 |
| 4379766 | Silyl esters of carboxylic acids by phase transfer catalysts Silyl esters of carboxylic acids, of the general formula ##STR1## are formed under mild conditions in the presence of a phase transfer catalyst when a silicon halide is contacted with a carboxylic acid salt wherein R1, R2, R | 04/12/1983 |
| 4376868 | Alkoxylation of cresylic acids Cresylic acid ethoxylation is catalyzed by basic compounds and salts of alkaline earth metals. Ethoxylates from such reactions have narrow ethylene oxide distributions, lower pour points and lower by-products as compared to alkali base catalyzed ethoxylat... | 03/15/1983 |
| 4375360 | Methanol fuel and methanol fuel additives Methanol fuels are modified by the addition of materials which provide required lubricity and protection for engine parts while retaining compatability with the methanol fuel. Methanol fuel is methanol itself or any fuel containing a majority of methanol ... | 03/01/1983 |
| 4374755 | Magnesium disiloxide compounds Novel magnesium disiloxide compounds and methods for their preparation are disclosed. The magnesium disiloxides so obtained are useful starting materials for the preparation of active catalysts for olefin polymerizations.... | 02/22/1983 |
| 4371455 | Supported catalyst for olefin polymerization A method for the preparation of supported Ziegler-Natta catalysts comprising the reduction of a transition metal compound with a magnesium containing reducing agent. The reducing agent is prepared in the presence of a magnesium chloride support utilizing ... | 02/01/1983 |
| 4360449 | Alumina dispersion behavior A method is provided for forming stable dispersions of boehmite alumina in water containing a peptizing acid by mixing said alumina with dilute aqueous acid solutions and treating the alumina prior to dispersion by heating at temperatures of from about 25... | 11/23/1982 |
| 4360359 | Method for relating shallow electrical anomalies to the presence of deeper hydrocarbon reservoirs A method is provided for evaluation of shallow electrical anomalies to determine which are likely to be caused by seepage from a hydrocarbon reservoir at depth. The method involves geochemical lithological, and petrographic analyses of anomalous sediments... | 11/23/1982 |
| 4360443 | Storage fire resistant hydraulic fluid A static storage stable fire resistant hydraulic fluid composition is provided which comprises (a) from about 40 to about 50 volume percent water together with (b) from about 50 to about 60 volume percent of a combination of (1) a lubricating oil (2) an emulsifier ... | 11/23/1982 |
| 4358572 | Method for the preparation of non-crystalline polymers of high molecular weight A process for the preparation of a drag reducing substance which comprises: (a) a transition metal catalyst slurry containing: 1. crystalline titanium halide having the general formula TiXn where n=2.5 to 3.0 and X is halogen, 2. a hydrocarbon diluent, and 3. an et... | 11/09/1982 |
| 4356071 | Thermally stable polyoxymethylene containing polymers A method is provided by which thermally stable polyoxymethylene containing polymers are produced. These polymers are prepared by polymerizing trioxane or formaldehyde which has been first treated with micro-wave radiation. Trioxane or formaldehyde treated... | 10/26/1982 |
| 4329515 | Catalyst removal from alcohol alkoxylates Basic compounds of Ba and Sr used in the production of peaked alcohol alkoxylates can be removed from the products by precipitating with some polybasic organic acids. Examples of effective acids include glutaric, diglycolic, adipic, and azelaic acids.... | 05/11/1982 |
| 4324560 | Pyrite removal from coal Pyrite is removed from coal by crushing, air classification and organic heavy medium separation. A superior method is taught wherein only a fraction of the total coal treated need be treated with organic media separation.... | 04/13/1982 |
| 4322566 | Magnesium oxide catalyst Amorphorus titanium, uranium, chromium ions and zirconium together with sulfate ions are effective promoters for magnesium oxide catalysts. These catalysts are active for the ortho methylation of phenols in the vapor phase to yield 2,6-xylenol.... | 03/30/1982 |
| 4311571 | Rapid phase transformation for poly(butene-1) Poly(butene-1) in type II form can be accelerated to its stable type I form by applying a volatile solvent such as an olefinic hydrocarbon and allowing the solvent to evaporate. The phase transformation can be accelerated by additional treatment with heat... | 01/19/1982 |
| 4306093 | Strontium catalyzed alkoxylations Strontium-containing materials catalyze the alkoxylation of alcohols. Strontium produced alkoxylates have sharper alkoxylate distributions, lower free alcohols, lower pour points, and better detergency than alkoxylates obtained from alkali base catalysis.... | 12/15/1981 |
| 4304135 | Constraint factor for structural monitoring A dual element strain gauge is placed near a welded or otherwise constrained joint on a structural member so as to provide a constraint factor. The location for the strain gauge must be selected to provide constraint factor that is preferably near either ... | 12/08/1981 |
| 4302613 | Inorganic catalyst for alkoxylation of alcohols Strontium and barium-based catalyzed alkoxylation of alcohols of all classes is carried out more rapidly and produces a more peaked reaction product when carried out in the presence of co-catalysts such as calcium oxide, calcium carbide, calcium hydroxide... | 11/24/1981 |
| 4297885 | Acoustic emission for detection and monitoring of crack initiation and propagation in materials Initiation and propagation of cracks in materials is detected and monitored by (a) adhering an acoustical emitter to the area of the material to be monitored, and (b) monitoring for acoustical signals emitted by the adhered emitter, said signals produced ... | 11/03/1981 |
| 4296057 | Method of making alumina fibers Alumina fibers are prepared by a method comprising (a) forming aluminum methoxide from aluminum alkoxides using methanol; (b) recovering aluminum methoxide as a solid precipitate phase, washing to remove higher alcohols and drying to recover a powder; (c) reacting ... | 10/20/1981 |
| 4292450 | Selective alkylation of 2,5-xylenol in the presence of 2,4-xylenol A mixture of 2,4-/2,5-xylenol can be alkylated with a suitable alkylating agent over a strongly acidic divinylbenzene-styrene copolymer to afford a greater amount of 4-t-alkyl-2,5-xylenol than 6-t-alkyl-2,4-xylenol provided the alkylation is carried out a... | 09/29/1981 |
| 4289679 | Method for producing solutions of drag reducing substances A method of producing ultra-high molecular weight polymers useful as drag reducing substances or antimist agents comprising; (1) polymerizing an alpha-olefin or olefins from 2 to 30 carbon atoms with a Ziegler catalyst in a light hydrocarbon solvent; (2) addin... | 09/15/1981 |
| 4285881 | Dioxane removal from ether sulfate Dioxane impurities in ether sulfates are removed by using a novel steam stripping technique in which water is neither added to nor removed from ether sulfate. This is possible because the chemical potential of water in the vapor phase is kept at the same ... | 08/25/1981 |
| 4283574 | Process for the synthesis of 2,6-xylenol and 2,3,6-trimethylphenol Phenol is methylated over an alumina catalyst using methanol, and the reaction product therefrom is combined with additional methanol over a promoted magnesium oxide catalyst. Major reaction products are ortho-cresol, 2,6-xylenol and 2,3,6-trimethylphenol... | 08/11/1981 |
| 4283514 | Chemicals for termination of polyvinylchloride polymerizations Butylation of a mixture of xylenols and trimethylphenols gives a product which is suitable for use as a stabilizer for polyvinyl chloride. The material can be added to the reactor during polymerization as a shortstopper and retain effectiveness as a stabi... | 08/11/1981 |
| 4271698 | Apparatus to measure plasticizer absorption in polymer powders The invention discloses an apparatus for measuring the diffusion of liquid into solids comprising (a) an upper portion having substantially sloped walls, the lower end of said sloped walls meeting to form an aperture, (b) solids retaining means positioned at s... | 06/09/1981 |
| 4271138 | Process for producing aluminum oxychloride solutions from low molecular weight aluminum alkoxides HCl gas is added to aluminum alkoxides containing from 1 to 5 carbon atoms (0.5 mole HCl/mole Al) and the mixture is hydrolyzed in water. Alcohol is recovered by azeotropic distillation and the product, a solution of aluminum oxychloride, is concentrated.... | 06/02/1981 |
