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| Number | Title | Issue Date |
| 5133947 | Hydrous trivalent chromium oxide/carbon particles and method of making the same Disclosed is a method of making particle which comprise hydrous trivalent chromium oxide having the empirical formula CrO2 H intimately associated with a pulverulent carbonaceous substrate. A composition is formed which comprises an aqueous sol... | 07/28/1992 |
| 5130490 | Purification of 3,5-diaminobenzotrifluoride by selective precipitation of the hydrochloride salt 3,5-Diaminobenzotrifluoride can be readily separated from 4-chloro-3,5-diaminobenzotrifluoride by the addition of hydrogen chloride. 3,5-Diaminobenzotrifluoride forms hydrochloride salt, while 4-chloro-3,5-diaminobenzotrifluoride does so much less readily... | 07/14/1992 |
| 5122238 | Efficient electrolytic method of making chromic acid from sodium bichromate Disclosed is a method of making chromic acid by electrolyzing an aqueous solution of sodium bichromate until the sodium bichromate is converted to chromic acid at a bichromate percent conversion of about 1 to about 48.4. Sulfuric Acid is then added to the... | 06/16/1992 |
| 5108722 | Sulfate removal from chlorate liquor Disclosed is a method of removing sulfate ion from an aqueous sodium chlorate liquor. A crystallization temperature is selected between about -15° and about 0° C. and the maximum concentration of sodium chlorate that is soluble in the liquor at that tem... | 04/28/1992 |
| 5104946 | Solutions of polyimidesiloxanes in butyrolactone Disclosed is a solution in butyrolactone of a diglyme-insoluble polyimidesiloxane. The polyimidesiloxane is the reaction product of a dianhydride selected from the group consisting of 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride, 3,3',4,4'-oxyd... | 04/14/1992 |
| 5104500 | Ion exchange removal of impurities from chlorate process liquors Disclosed is an improved method of operating a sodium chlorate crystal production system where a brine stream is electrolyzed to form sodium chlorate, the sodium chlorate is crystallized in a crystallizer, and the mother liquor from a crystallizer is recy... | 04/14/1992 |
| 5098593 | Mixtures of perchloroethylene and monochlorotoluene Disclosed is a composition of about 25 to about 85 wt % perchloroethylene and about 15 to about 75 wt % monochlorotoluene. When the composition contains at least about 30 wt % perchloroethylene it does not display a flash point.... | 03/24/1992 |
| 5084261 | Recovery and utilization of gypstack leachate in hemihydrate phosphoric acid process Disclosed is a process for treating a waste stream containing calcium sulfate by depositing said waste stream on a gypstack, collecting the leachate from the gypstack, and recovering the P2 O5 values therefrom. Also disclosed is appa... | 01/28/1992 |
| 5079390 | Lock-out device for circuit breakers Disclosed is a device that can be placed on the lever arm of a switch and locked to prevent the switch from being turned on. The device comprises a rigid body having a clasping device for removably fixing the rigid body to the lever arm, an aperture throu... | 01/07/1992 |
| 5077370 | Novel polyimidesiloxanes and methods for their preparation and use Substantially fully imidized polyimidesiloxanes which are based on a selected pyridine compound are soluble in diglyme which gives them particular utility in the micro-electronics industry. The polymers are prepared from the dianhydride, a difunctional si... | 12/31/1991 |
| 5066693 | Molding compositions of resole phenolic resin and epoxy resin Phenolic molding compositions, particularly useful as sheet molding compositions comprise: 1) a resole phenole resin, 2) a thickening agent selected from the group consisting of alkaline earth metal oxides or hydroxides and silanes, 3) a filler selected f... | 11/19/1991 |
| 5053106 | Low friction, wear resistant plastic parts Plastic molded articles having low friction and excellent wear resistance are produced by treating the surface of the plastic article with an aqueous solution of an inorganic fluoride such as hydrogen fluoride. Plastic articles which can be made in accord... | 10/01/1991 |
| 5034370 | Color developer for pressure-sensitive recording paper A color developer for pressure-sensitive recording paper is produced by admising components comprising: (A) 100 parts by weight of a polyvalent metal salt of a co-condensation product of a substituted salicylic acid, an aromatic hydrocarbon and an aldehyd... | 07/23/1991 |
| 5034211 | Reducing turbidity in chromic acid solutions Disclosed is a method of reducing the turbidity of an aqueous solution of chromic acid which is formed by dissolving melted chromic anhydride in water. The chromic anhydride is contacted with water in an amount in excess of 0.02 wt %, but insufficient to ... | 07/23/1991 |
| 5032279 | Separation of fluids using polyimidesiloxane membrane Disclosed is a method of separating a first fluid from a mixture with a second fluid by placing the mixture in contact with a polyimidesiloxane membrane. The first fluid preferentially passes through the membrane, thereby separating the fluids. The polyim... | 07/16/1991 |
| 5008361 | Crystalline polyimidesiloxanes Novel crystalline polyimidesiloxanes are prepared by reacting BTDA, and a siloxane monomer with a diamine selected from bis-4(4-aminophenoxy) phenyl sulfone and 2,2-bis-4(4-aminophenoxy) phenyl propane. The products have low water absorption.... | 04/16/1991 |
| 5001250 | Purification of bidentate organophosphorous extractants Crude N,N-dialkylcarbamoylmethylphosphonates and phosphine oxide extractants, and particularly crude dihexyl N,N-diethylcarbamoylmethylphosphonate and octylphenyl N,N-diisobutylcarbamoyl phosphine oxide, are purified by distilling the crude materials... | 03/19/1991 |
| 4997638 | Production of hexametaphosphates from other phosphates Disclosed is a method of making hexametaphosphates by reacting sodium tripolyphosphate, tetrasodium pyrophosphate, or trisodium phosphate with phosphoric acid, forming a molten glass of said mixture, and chilling said molten glass to form a solid.... | 03/05/1991 |
| 4997637 | Digestive crystallizing process and apparatus for purification of KC1 Disclosed is a method of reducing the sodium chloride content of potassium chloride by forming an aqueous slurry of potassium chloride feed crystals having a wide particle size distribution with an average diameter of about 0.1 to about 50 microns in a li... | 03/05/1991 |
| 4997908 | Solvent resistant polymidesiloxane Disclosed is a substantially fully imidized diglyme-insoluble, N-methylpyrrolidone-soluble polyimidesiloxane which is the reaction product of a dianhydride, about 1 to about 5% by weight of a mono-anhydride, and a mixture of about 20 to about 50% by weigh... | 03/05/1991 |
| 4996278 | Novel polyimidesiloxanes and methods for their preparation and use based on diamines with pendant fluorine groups Substantially fully imidized polyimidesiloxanes which are based on a selected pyridine compound are soluble in diglyme which gives them particular utility in the micro-electronics industry. The polymers are prepared from the dianhydride, a difunctional si... | 02/26/1991 |
| 4994248 | P2 O5 recovery and phosphoric acid purification Disclosed is an improved process for purifying phosphoric acid where a calcium sulfate hemihydrate slurry is first filtered to produce a first filtrate and a filter cake which comprises calcium sulfate hemihydrate, the calcium sulfate hemihydrate filter c... | 02/19/1991 |
| 4990674 | Synthesis of aliphatic aromatic phosphine oxides Disclosed is a method of making an aliphatic aromatic phosphine oxide by reacting an aliphatic aromatic phosphinic acid with a halogenating agent to produce a phosphoryl halide, reducing the phosphoryl halide to a phosphinous halide, hydrolyzing the phosp... | 02/05/1991 |
| 4990670 | Method of making 1,1'-oxybis (3-nitro-5-trifluoromethyl)-benzene Disclosed is a method of making 1,1'-oxybis (3-nitro-5-trifluoromethyl)-benzene by heating a nitro benzofluoride compound having the formula ##STR1## where "X" is selected from the group consisting of NO2, Cl, and F, with an alkali me... | 02/05/1991 |
| 4981999 | Selective removal of chlorine from chlorophthalic compounds Disclosed is a method of selectively removing chlorine atoms in the order of fifth position first, fourth position second, and third position third from a chlorophthalic compound having at least two ring chlorine atoms such as a chlorophthalic acid or a c... | 01/01/1991 |
| 4978798 | Method of making halobenzophenones and intermediates thereof Disclosed is a method of making a bisphenyl dihalomethane by reacting a trihalomethylbenzene with a halobenzene and a Lewis acid. The bisphenyl dihalomethane can than be reacted with water to form a halobenzophenone. In an optical third step ring chlorine... | 12/18/1990 |
| 4975323 | Ferrophosphorus particles treated with hypophosphorous acid The conductivity of ground ferrophosphorus particles is increased by contacting the particles with an aqueous solution of hypophosphorus acid, preferably at a temperature between room temperature and about 50°C. The particles are then washed and dried an... | 12/04/1990 |
| 4967838 | Oil well and method using completion fluid Disclosed is a method of preventing fluids in the ground from rising around an oil well pipe by filling the space around the pipe with an oil well completion fluid comprising water, about 50 to about 65% by weight, based on total fluid weight, of dipotass... | 11/06/1990 |
| 4954639 | Single pot process for making a fluoroanthranilic acid Disclosed is a method of making ionized fluoroanthranilic acid from a fluorophthalic compound in a single pot process without isolating any intermediate product. A composition is prepared which comprises an aqueous solution of water, a fluorophthalic comp... | 09/04/1990 |
| 4935213 | Zero discharge process for preparing potassium tripolyphosphate Disclosed is a method of making potassium tripolyphosphate by loading an ion exchange resin with either potassium or hydrogen ions and passing an aqueous solution of sodium tripolyphosphate through the resin so that the sodium ions of the sodium tripolyph... | 06/19/1990 |
| 4922012 | Compositions of matter comprising dialkyl-(N,N-dialkylcarbamoylmethyl) phosphine oxides Novel organic tertiary phosphine oxides for example, bidentate organophosphorus actinide extractants, such as the carbamoylmethylphosphine oxides (CMPO's) are disclosed, such compounds can be prepared (e.g., in 85% or better yield and purity) by a process... | 05/01/1990 |
| 4906522 | Compounds of nickel, iron and phosphorus Compositions of nickel, iron and phosphorus, are prepared by fusing nickel and ferrophosphorus in an inert atmosphere, with the nickel preferably comprising from about 5% to about 70% by weight of the composition. The fused composition is ground or atomiz... | 03/06/1990 |
