Group Va Metal Or Arsenic (sb, Bi, Or As) Patents (Class 423/617)
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Patent number: 5306742Abstract: Disclosed are novel antimony oxide flame retardant dispersions containing trivalent antimony deposited on the surface of antimony pentoxide particles, which compositions are particularly useful for providing flame retardancy to fiberglass products.Type: GrantFiled: December 26, 1991Date of Patent: April 26, 1994Assignee: Nyacol Products Inc.Inventor: Donald P. Kintz
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Patent number: 5262063Abstract: In the process of removing heavy metals from aqueous solutions by precipitation of a salt thereof at increased pH, multiple stage precipitation by upward stepwise pH adjustment and solid separation at each stage is used to facilitate the manufacture of a product of high purity.Type: GrantFiled: May 14, 1992Date of Patent: November 16, 1993Assignee: Elf Atochem North America, Inc.Inventor: Jeffrey H. Yen
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Patent number: 5213785Abstract: This invention concerns an improved means of oxidizing aqueous dispersions of antimony trioxide to colloidal hydrous antimony pentoxide in a continuous flow system. The oxidant is hydrogen peroxide and the continuous flow system nominally consists of a static mixer and a tubular reactor.Type: GrantFiled: October 21, 1991Date of Patent: May 25, 1993Assignee: Phillips Petroleum CompanyInventors: Denton C. Fentress, Kent E. Mitchell, Don W. Godbehere, Larry S. Maddox, Richard E. Lowery, Howard F. Efner
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Patent number: 5173475Abstract: A Bi-Pb-Sr-Ba-Ca-Cu-O system superconductor having a composition of:Bi.sub.l Pb.sub.m Sr.sub.p Ba.sub.q Ca.sub.y Cu.sub.z O.sub.xwherein l, m, p, q, y and z satisfy the following inequalities:0.50<l<1.500.01.ltoreq.m.ltoreq.0.600.70.ltoreq.p.ltoreq.1.600.005.ltoreq.q.ltoreq.0.800.70.ltoreq.y.ltoreq.1.601.40.ltoreq.z.ltoreq.3.00which has the critical temperature of at least 77 K, and contains the high T.sub.c phase in a high fraction.Type: GrantFiled: June 29, 1989Date of Patent: December 22, 1992Assignees: Kabushiki Kaisha Kobe Seiko Sho, NEC Corporation, Osaka Cement Co., Ltd., Seisan Kaihatsu Kagaku Kenkyusho, Toda Kogyo Corp., Tosoh CorporationInventors: Toshio Takada, Mikio Takano, Yoshinari Miura, Jun Takada, Kiichi Oda, Naoichi Yamamoto
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Patent number: 5173476Abstract: A superconductor consisting of a sufficiently pure phase of the oxides of Bi, Sr, Ca, and Cu to exhibit a resistive zero near 110K resulting from the process of forming a mixture of Bi.sub.2 O.sub.3, SrCO.sub.3, CaCO.sub.3 and CuO into aparticulate compact wherein the atom ratios are Bi.sub.2, Sr.sub.1.2-2.2, Ca.sub.1.8-2.4, Cu.sub.3. Thereafter, heating the particulate compact rapidly in the presence of oxygen to an elevated temperature near the melting point of the oxides to form a sintered compact, and then maintaining the sintered compact at the elevated temperature for a prolonged period of time. The sintered compact is cooled and reground. Thereafter, the reground particulate material is compacted and heated in the presence of oxygen to an elevated temperature near the melting point of the oxide and maintained at the elevated temperature for a time sufficient to provide a sufficiently pure phase to exhibit a resistive zero near 110K.Type: GrantFiled: October 3, 1988Date of Patent: December 22, 1992Assignee: The United States of America as represented by the United States Department of EnergyInventors: Boyd W. Veal, John W. Downey, Daniel J. Lam, Arvydas P. Paulikas
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Patent number: 5168095Abstract: A composite oxide synthesized by a citrating process and utilized in functional ceramics materials is prepared by the following process. Co-precipitants or mixtures of at least one component selected from the group consisting of carbonates, basic copper and/or hydroxides of elements which compose a composite oxide are reacted with citric acid in an aqueous solution or in an organic solvent. The elements are selected from at least one element of the group consisting of Y, rare earth elements, transition elements, and alkali metal or alkaline earth metal elements. The citrate compound formed is baked to complete the composite oxide.The composite oxide synthesized by this invention has superconduction at the most temperature of 93.degree. K. with excellent Meissner effect.Type: GrantFiled: February 21, 1991Date of Patent: December 1, 1992Assignees: Nissan Motor Company Ltd., Seimi Chemical Co. Ltd.Inventors: Fumio Munakata, Mitsugu Yamanaka, Susumu Hiyama
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Patent number: 5158705Abstract: Disclosed is a method for preparing aqueous negatively charged tin oxide sols having substantially uniform particle size no greater than about 50 nm and preferably from about 5 to about 20 nm, the sols being characterized as being substantially free of any other reagents which may adversely affect contemplated usage as a catalyst.Type: GrantFiled: January 2, 1992Date of Patent: October 27, 1992Assignee: Nyacol Products, Inc.Inventor: Thomas F. Swank
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Patent number: 5151407Abstract: Bulk form of superconducting materials are produced by pouring a melt a O.sub.2 -containing superconducting material into a heated mold, cooling the mold until solidification begins, removing the cast object from the mold, gradually cooling the cast object to prevent the development of thermal stresses, and then annealing the cast, cooled object to restore O.sub.2 to near equilibrium levels. The bulk form produced according to the present invention may be used as a sputtering target in the production of wires, or as a bulk form semiconductor.Type: GrantFiled: February 28, 1990Date of Patent: September 29, 1992Assignee: The United States of America as represented by the Secretary of the NavyInventors: Virgil Provenzano, Anand K. Singh, M. A. Imam, Kuntimadi Sadananda, William F. Henshaw
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Patent number: 5137640Abstract: A process for reducing arsenic levels in a solution containing sulfuric acid, water, and arsenic acid by adding copper or a copper-containing compound to the solution to form dissolved copper arsenate, adding alkali solution to precipitate the copper arsenate and to neutralize arsenic and sulfuric acid. The copper arsenate is separated, and the remaining solution is treated with a ferric compound and an alkali in order to form ferric arsenate to remove residual arsenate. The ferric arsenate is separated and the remaining solution contains less than about 0.79 ppm arsenic. The ferric compound is added so that the ratio of iron to arsenic is about 8:1 to about 10:1 and alkali is added during this step to adjust the pH to from about 5 to about 7.Type: GrantFiled: May 6, 1991Date of Patent: August 11, 1992Assignee: Allied-Signal Inc.Inventor: Rustom P. Poncha
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Patent number: 5126316Abstract: Compositions having the nominal formula Bi.sub.2 Sr.sub.3-x Y.sub.x Cu.sub.2 O.sub.8+y wherein x is from about 0.05 to about 0.45 and y is from about 0 to about 1 are superconducting.Type: GrantFiled: August 24, 1988Date of Patent: June 30, 1992Assignee: E. I. Du Pont de Nemours and CompanyInventors: Arthur W. Sleight, Munirpallam A. Subramanian
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Patent number: 5108732Abstract: A process for preparing finely-divided oxides of metals of metalloids of the elements of main groups III and IV and sub-groups III, IV, V and VI of the Periodic System of Elements, comprising reacting compounds of these elements with a polymerizable hydrocarbon compound or mixture to form a polymer product, which is then thermally treated to yield the oxide product.Type: GrantFiled: October 25, 1990Date of Patent: April 28, 1992Assignee: Bayer AktiengesellschaftInventors: Wolgang Krumbe, Benno Laubach
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Patent number: 5098868Abstract: Vanadium-containing superconducting oxides are disclosed having critical temperature (T.sub.c) values of above about 100.degree. K. and preferably about 110.degree.-150.degree. K., together with predicted current density (J.sub.c) values on the order of 10.sup.4 -10.sup.5 amperes/cm.sup.2. The oxides hereof are moreover relatively ductile and easily bulk sintered to give end products having desirable superconductivity characteristics. Certain preferred oxides of the invention are defined by the general formula:(V.sub.1-x M.sub.x).sub.i (A.sub.1-y M.sub.y).sub.j Q.sub.k Cu.sub.m O.sub.r.+-.t I.Type: GrantFiled: October 1, 1990Date of Patent: March 24, 1992Assignee: University of KansasInventors: Kai W. Wong, Wai-Yim Ching, Peter C. W. Fung, Fui T. Chan, Zhengzhi Sheng
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Patent number: 5089241Abstract: The present invention provides a process for the conversion of hazardous hexafluoroarsenic acid or any salt thereof to arsenic acid or salt thereof which can be rendered nonhazardous. In particular, the hexafluoroarsenic acid or salt is converted to arsenic acid or salt which can be converted to a water insoluble salt. Known insolubilization and stabilization technology then renders the material nonhazardous.The present process involves converting hexafluoroarsenic acid or salt thereof contained in an aqueous mixture to arsenic acid or salt thereof.Type: GrantFiled: December 20, 1990Date of Patent: February 18, 1992Assignee: Allied-Signal Inc.Inventors: Robert A. Smith, Douglas G. Frick, Charles L. Redmon, Somanahalli N. Subbanna
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Patent number: 5072031Abstract: Layered divalent metal pentavalent metallate, M(HAO.sub.4).sub.x (RAO.sub.3).sub.y (Z).sub.z wherein M is divalent metal, A is a pentavalent metal, e.g. phosphorus, R is a substituent group other than H or OH, e.g., phenyl, covalently bonded to A, x+y=1, y is greater than 0, z ranges from 0 to 2, inclusive, and Z is an intercalated moiety is prepared by contacting a source of divalent metal with a substituted phosphonic acid-type compound under hydrothermal conditions.Type: GrantFiled: July 9, 1990Date of Patent: December 10, 1991Assignee: Mobil Oil Corp.Inventor: Stuart D. Hellring
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Patent number: 5061682Abstract: Ceramic precursor mixtures containing a metal cation, a carbohydrate, and an anion capable of participating in an anionic oxidation-reduction reaction with the carbohydrate for continuous or batchwise drying and pyrolyzing to provide ceramic powders.Type: GrantFiled: January 17, 1990Date of Patent: October 29, 1991Assignee: The Washington Technology CenterInventors: Ilhan A. Aksay, Chan Han, Gary D. Maupin, Corrie B. Martin, Randal P. Kurosky, Gregory C. Stangle
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Patent number: 5057488Abstract: A reactant particulate mixture comprised of Bi.sub.2 CaSr.sub.2 Cu.sub.2 O.sub.8.+-.x where x ranges from 0 to 0.5, Ca.sub.2 CuO.sub.3, cupric oxide and lead oxide is formulated and reacted to produce superconductive Bi.sub.2-y Pb.sub.y Ca.sub.2 Sr.sub.2 Cu.sub.3 O.sub.10.+-.z where y ranges from 0.1 to 0.5 and z ranges from zero to less than 1.Type: GrantFiled: February 12, 1990Date of Patent: October 15, 1991Assignee: General Electric CompanyInventors: Ronald H. Arendt, Mary F. Garbauskas
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Patent number: 5057486Abstract: A particulate mixture comprised of Bi.sub.2 CaSr.sub.2 Cu.sub.2 O.sub.8.+-.x where x ranges from 0 to 0.5, Ca.sub.2 CuO.sub.3, cupric oxide and lead oxide, wherein the Bi.sub.2 CaSr.sub.2 Cu.sub.2 O.sub.8.+-.x crystals are oriented with their c-axis at least sufficiently parallel to each other so as not to differ significantly from a common direction, is initially reacted producing an intermediate swollen partially reacted product which is pressed to remove the swelling and then sintered to produce a superconductive Bi.sub.2 yPb.sub.y Ca.sub.2 Sr.sub.2 Cu.sub.3 O.sub.10.+-.z body where y ranges from 0.1 to 0.5 and z ranges from zero to less than 1.Type: GrantFiled: March 5, 1990Date of Patent: October 15, 1991Assignee: General Electric CompanyInventors: Ronald H. Arendt, Mary F. Garbauskas
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Patent number: 5019553Abstract: A metal oxide material is provided which is represented by the composition formula:A.sub.2 B.sub.x Cu.sub.y O.sub.zwherein 2.ltoreq.x.ltoreq.3.5, 2.ltoreq.y.ltoreq.3.5, x+y>4, and 4<z; A is an element or a group of elements selected from alkaline earth metal elements; and B is an element or a group of elements selected from the group of elements consisting of bismuth, lead and thallium. The material has a superconductivity transition temperature of from 4.2K to 12K.Type: GrantFiled: December 13, 1988Date of Patent: May 28, 1991Assignee: Canon Kabushiki KaishaInventors: Jun Akimitsu, Tohru Den
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Patent number: 5013532Abstract: This invention relates to the metallurgy of iron and particularly to the separation and recovery of metals from electric arc furnace (EAF) dusts. While the invention discloses a process for the separation and recovery applicable to zinc, lead, cadmium and antimony contained in such EAF dusts, the invention is particularly applicable to the separation and recovery of zinc. This invention describes a method for reducing the zinc contained in an EAF dust, volatilizing the metallic zinc so produced from the mass of the dust, and reoxidizing the metallic zinc to zinc oxide along with the simultaneous regeneration of hydrogen which can be recycled to treat additional EAF dust.Type: GrantFiled: December 15, 1988Date of Patent: May 7, 1991Assignee: IIT Research InstituteInventor: Guggilam C. Sresty
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Patent number: 5008036Abstract: A colloidal dispersion of hydrous antimony pentoxide particles is made by a process which comprises introducing a particulate antimony component selected from the group consisting of antimony metal and antimony trioxide into an essentially aqueous medium and contacting said antimony component with hydrogen peroxide at a temperature of from about 0.degree. C. to about the decomposition temperature of the reaction mixture for a length of time sufficient to convert at least a portion of the antimony component to colloidal particles of hydrous antimony pentoxide.Type: GrantFiled: August 18, 1975Date of Patent: April 16, 1991Assignee: Laurel Industries, Inc.Inventors: Charles E. Crompton, Abdulla M. Z. Kazi, Inderjit S. Soni
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Patent number: 4997810Abstract: An inorganic powder is vibrated while being calcined. The vibrations suspend the powder as in a conventional gas-fluidized system, without clumping, but without loss of fines. As applied to superconductor precursor powders, the treatment accelerates growth of the superconducting phase. The invention includes a novel furnace system for simultaneously heating and vibrating the powders.Type: GrantFiled: October 5, 1989Date of Patent: March 5, 1991Assignee: W. R. Grace & Co.-Conn.Inventors: Nicholas D. Spencer, Jean W. Beeckman
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Patent number: 4990488Abstract: Black crystal compositions having the empirical composition Bi.sub.a Sr.sub.b Cu.sub.c O.sub.d are described where a+b+c=1, A=0.36-0.557, b=0.098-0.496, c=0.1-0.4 and d=approximately 1+a/2. These compositions have a superconducting transition temperature T.sub.c for superconductivity of greater than 20 K and contain a principal phase which crystallizes in the orthorhombic system. They can be prepared from the mixture of the oxides in the atomic ratio stated by heating to 700.degree.-1000.degree. C.Type: GrantFiled: November 23, 1988Date of Patent: February 5, 1991Assignee: Hoechst AktiengesellschaftInventors: Hans-Georg von Schnering, Winfried Becker, Martin Schwarz, Leonhard Walz, Elfi Waldschmidt, Joachim Adam
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Patent number: 4962228Abstract: Layered divalent metal pentavalent metallate, M(HAO.sub.4).sub.x (RAO.sub.3).sub.y (Z).sub.z wherein M is divalent metal, A is a pentavalent metal, e.g. phosphorus, R is a substituent group other than H or OH, e.g., phenyl, covalently bonded to A, x+y=1, y is greater than O, z ranges from 0 to 2, inclusive, and Z is an intercalated moiety is prepared by contacting a source of divalent metal with a substituted phosphonic acid-type compound under hydrothermal conditions.Type: GrantFiled: December 29, 1987Date of Patent: October 9, 1990Assignee: Mobil Oil CorporationInventor: Stuart D. Hellring
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Patent number: 4933317Abstract: A new class of Bi-based superconductive oxides is disclosed. As do the previously known Bi-based superconductors, the novel materials have a perovskite-like crystal structure. However, in contradistinction to the prior art materials, the inventive materials have unmixed B-site occupany, with all substituents occupying A-sites. This tends to produce marginal stability and enhanced transition temperatures, as compared to the prior art Bi-based oxide superconductors. Materials according to the invention have composition ABiO.sub.3-.delta., with A being Ba and at least one monovalent element (typically chosen from Na, K,Rb, and Cs) and 0.ltoreq..delta..ltorsim.0.1, and have a transition temperature T.sub.c.sup.onset .gtorsim.13K. The superconductive materials are advantageously produced from precursor material that contains an excess of the monovalent element(s), as compared to the final composition.Type: GrantFiled: April 25, 1988Date of Patent: June 12, 1990Assignee: American Telephone and Telegraph CompanyInventors: David W. Johnson, Jr., Leonard F. Mattheiss
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Patent number: 4929588Abstract: A method for removing 99% of the sodium ions from a natural or industrial brine containing dissolved salts of metals of Group 1A of the periodic chart and in which brine sodium ions are not the predominant metal ions by contacting the brine at pH 11 to 12 with an ion exchanger selected from crystalline antimonic acid and polyantimonic acid, and removing from contact with the ion exchanger the brine with greater than 99% of the sodium ions removed.Type: GrantFiled: June 8, 1989Date of Patent: May 29, 1990Assignee: Lithium Corporation of AmericaInventors: Teresita C. Frianeza-Kullberg, Darrish W. Barnette
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Patent number: 4909839Abstract: Disclosed is a method for recovering lead from a scrap which contains lead oxide, lead sulfate and antimony in an oxidized state. The method comprises the steps of:(a) continuously charging a refractory lined reaction vessel with the scrap together with a reductant effective for reducing lead oxide;(b) melting and agitating the charged material by means of a submerged lance at a temperature of from about 900.degree. C. to about 1150.degree. C. whereby some lead oxide of the scrap is reduced to form molten lead;(c) forming a slag layer above the molten lead produced in step (b);(d) maintaining an amount of lead oxide in the slag layer;(e) removing the molten lead, the removed lead having less than 0.5% by weight of antimony; and(f) concentrating as oxide in the slag layer the antimony oxide in the scrap.Type: GrantFiled: January 15, 1988Date of Patent: March 20, 1990Assignee: Mount Isa Mines LimitedInventor: Richard G. Hollis
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Patent number: 4908191Abstract: A method and apparatus are described for removing arsine from a gaseous stream such as the gaseous effluent stream from an MOCVD operation in which arsine is employed as an arsenic source. The arsine is burned in the gas phase in the presence of oxygen (air) to form arsenic oxide and a gaseous effluent stream in which all or part of the arsenic oxide is entrained. The arsenic oxide is removed from this stream by washing the same with an aqueous stream thereby forming an aqueous solution of arsenic oxide. At least a portion of this aqueous solution is recirculated to the aqueous spray so that a progressively enriched aqueous solution of arsenic oxide is formed. Periodically an insoluble arsenic containing compound is precipitated from the solution before it becomes saturated with arsenic oxide. Thus, arsine is eliminated from gaseous streams and converted into harmless forms which can be readily handled and disposed of without harm to the environment.Type: GrantFiled: July 21, 1987Date of Patent: March 13, 1990Assignee: Ethyl CorporationInventors: Steven I. Boldish, Irfan A. Toor
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Patent number: 4891207Abstract: Manufacture of arsenic acid by oxidation of arsenic trioxide with hydrogen peroxide is potentially hazardous, especially when making concentrated solutions of arsenic acid as sought by the users. The process also can suffer from substantial wasteful decomposition of hydrogen peroxide. The problems arise from or are exacerbated by the nature of the reactants, the exothermic character of the principal and decomposition reactions and the formation of localized hot spots.The problems can be ameliorated by introducing the reagents with agitation into a body of reaction product and maintaining the reaction mixture at a temperature of not more than 70.degree. C. and preferably 45.degree. to 55.degree. C. By carrying out the process in such a manner, it can accomodate even low grade arsenic trioxide as reagent.Type: GrantFiled: March 6, 1986Date of Patent: January 2, 1990Inventor: Andrew D. J. Broome
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Patent number: 4891061Abstract: Arsenic and antimony are separated from speiss by a roasting operation employing pyrite and coke and the arsenic is separated from the resultant product by a water pressure leaching operation.Type: GrantFiled: April 21, 1986Date of Patent: January 2, 1990Assignee: ASARCO IncorporatedInventors: Thomas P. Clement, II, John R. Wettlaufer, Jack A. Scott
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Patent number: 4891197Abstract: A method for synthesizing a crystalline silicophosphoaluminate is provided. The composition has ion-exchange properties and is readily convertible to catalytically active material. The synthesis method requires an organic phase, and an aqueous phase. The silicon, phosphorus and aluminum components of the silicophosphoaluminate may, optionally, be replaced with other elements in the plus 4, 5 and 3 valence states, respectively.Type: GrantFiled: June 26, 1986Date of Patent: January 2, 1990Assignee: Mobil Oil CorporationInventors: Eric G. Derouane, Roland von Ballmoos
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Patent number: 4888207Abstract: Arsenic, in the form of As.sub.2 O.sub.3, is recovered from arsenical ores or concentrates by leaching with a hot acidic ferric salt solution to extract arsenic, followed by cooling the pregnant leach solution to crystallize As.sub.2 O.sub.3. Leaching of some ores or concentrates is facilitated by addition of silver sulfate or mercuric sulfate to catalyze the leaching reaction.Type: GrantFiled: March 15, 1984Date of Patent: December 19, 1989Inventors: Charles M. Flynn, Jr., Thomas G. Carnahan
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Patent number: 4880771Abstract: Novel superconductive Pb-substituted oxides are disclosed. The oxides all have layered perovskite-like crystal structure, and manifest superconductivity (R=o) above about 77K. The materials are described by the nominal formula X.sub.2+x M.sub.3-x Cu.sub.2 O.sub.8.+-..delta., where X is Bi and Pb, M is Sr and Ca, 0.ltoreq..times..ltoreq.0.3, 0.ltoreq..delta..ltoreq.0.5, the Pb/Bi ratio is between about 0.2 and about 0.5, and the Sr/Ca ratio is between 0.5 and 2.Type: GrantFiled: February 26, 1988Date of Patent: November 14, 1989Assignee: American Telephone and Telegraph Company, AT&T Bell LaboratoriesInventors: Robert J. Cava, Steven A. Sunshine
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Patent number: 4873073Abstract: Minute spherical bismuth (III) oxide particles are produced by adding a monocarboxylic acid to an aqueous solution containing trivalent bismuth ions thereby inducing formation of a bismuth-monocarboxylic acid complex in the aqueous solution, further adding an alkali to the aqueous solution thereby inducing precipitation of the complex, separating the precipitated complex from the solution, and firing the separated complex.Type: GrantFiled: March 7, 1989Date of Patent: October 10, 1989Assignees: Agency of Industrial Science and Technology, Ministry of International Trade and IndustryInventors: Haruo Matsui, Ippei Nakagawa, Kiyotaka Kato
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Patent number: 4853207Abstract: Process for the manufacture of vitreous metal oxides in which a metal alcoholate derived from an alcohol, the pka of which is less than 15.74, is hydrolysed with an aqueous medium, the pH of which is greater than 1.5. The process is applied especially to the manufacture of vitreous zirconium oxide.Type: GrantFiled: February 19, 1987Date of Patent: August 1, 1989Assignee: Solvay & Cie (Societe)Inventors: Henri Wautier, Franz Legrand, Luc Lerot
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Patent number: 4843059Abstract: A superconducting mixed valence copper oxide, having a formula of the type:(La.sub.2-x (Y.sub.x" Bi.sub.1-x").sub.x' Sr.sub.x-x').sub.1-e CuO.sub.4-y,where:0.ltoreq.x<0.30.ltoreq.x'.ltoreq.0.2 with x'<x0.ltoreq.x".ltoreq.10<y.ltoreq.0.10.ltoreq.e.ltoreq.0.005.Type: GrantFiled: March 10, 1988Date of Patent: June 27, 1989Assignee: Compagnie Generale D'ElectriciteInventors: Francis Deslandes, Claude Michel, Jackie Provost, Bernard Raveau, Andre Sulpice, Jean-Louis Tholence, Bernard Chevalier
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Patent number: 4804496Abstract: A process is disclosed for producing a powdered antimony pentoxide composition that rapidly disperses on contact with water. The process comprises spray drying the antimony sol at a temperature of from 180.degree. to 210.degree. F.Type: GrantFiled: March 16, 1987Date of Patent: February 14, 1989Assignee: Phillips Petroleum CompanyInventors: Richard E. Lowery, Denton C. Fentress, Don W. Godbehere
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Patent number: 4775412Abstract: An aqueous sol of a crystalline tin oxide solid solution containing antimony and having a particle size not larger than 300.ANG. is prepared by adding an alkali metal bicarbonate or ammonium bicarbonate to an acidic aqueous solution containing a compound of tin and a compound of antimony to form a gel; purifying the gel; adding aqueous ammonia to the purified gel to form a slurry; and heating the slurry until a sol is formed.Type: GrantFiled: March 9, 1987Date of Patent: October 4, 1988Assignee: Taki Chemical Co., Ltd.Inventors: Hiroshi Nishikura, Shin Yamamoto, Yukio Terao
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Patent number: 4769230Abstract: Arsenic acid is formed from arsenous acid and water under oxygen pressure with catalytic amounts of nitric acid and a halide whereby the nitric oxide by-product is regenerated to nitric acid for contact with fresh arsenous acid.Type: GrantFiled: August 2, 1982Date of Patent: September 6, 1988Assignee: Koppers Company, Inc.Inventors: Nicholas P. Greco, Byung K. Ahn, John J. Kozak
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Patent number: 4759917Abstract: Gallium is recovered from gallium arsenide by reacting and dissolving the gallium arsenide with an oxidant and a complexing agent, especially with water insoluble hydroxamic acids with mild conditions, e.g. with aqueous hydrogen peroxide and mild temperature, to effect separation of gallium hydroxamic acid chelates from water soluble arsenic compounds.Type: GrantFiled: February 24, 1987Date of Patent: July 26, 1988Assignee: Monsanto CompanyInventors: James P. Coleman, Bruce F. Monzyk
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Patent number: 4751063Abstract: A process in which spent catalyst from chlorofluorocarbon production is treated to detoxify the catalyst for safe disposal or reprocessing. The spent catalyst includes antimony and arsenic halides, halogenated organic liquids, and has an upper liquid portion and a lower sludge or semisolid portion. The processing of both the liquid and sludge portions includes hydrolyzing the catalyst in an aqueous solution of ferric chloride resulting in formation of a ferric ion/fluoride ion complex in addition to insoluble compounds, and neutralizing the reaction mass following hydrolysis with an aqueous suspension of calcium hydroxide. The volatile organics are stripped from the neutralized reaction mass and collected for reuse or disposal. The reaction mass is dried to yield the insoluble compounds in a solid form for subsequent reprocessing or disposal.Type: GrantFiled: February 19, 1987Date of Patent: June 14, 1988Assignee: International Technology CorporationInventors: Victor Kalcevic, John F. McGahan
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Patent number: 4727053Abstract: A novel cracking catalyst, a method of preparing same and an improved hydrocarbon cracking process are provided wherein adverse effects of metals such as nickel, vanadium, iron, copper and cobalt in the cracking catalyst are precluded or mitigated by contacting the cracking catalyst with an antimony treating agent comprising at least one of elemental antimony and compounds thereof and a lithium treating agent comprising at least one of elemental lithium and compounds thereof whereby there is added to said catalyst a modifying amount of each antimony treating agent and lithium treating agent with the weight ratio of antimony to lithium being such as to provide passivation of contaminating metals greater than the sum of the passivation effect of each of antimony treating agent and lithium treating agent individually.Type: GrantFiled: August 11, 1986Date of Patent: February 23, 1988Assignee: Phillips Petroleum CompanyInventors: Brent J. Bertus, Darrell W. Walker
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Patent number: 4722774Abstract: Antimony, or antimony and arsenic, are recovered from a halocarbon-containing spent antimony pentachloride catalyst, such as a catalyst used in the manufacture of fluorocarbons, in a manner that produces a substantially nontoxic waste product that is environmentally acceptable for disposal in a landfill. In the process, the antimony pentachloride in the spent catalyst is reduced to antimony trichloride, which is extracted from the reduced agent catalyst by means of an aqueous acid, arsenic trichloride which is commonly also present in such spent catalyst is extracted at the same time, the aqueous extract is separated from an organic phase which can be disposed of by incineration, the metal values are removed from the aqueous extract by further reduction and separation of, and the residual aqueous acid phase is neutralized and solidified by the addition of lime or other environmentally acceptable base.Type: GrantFiled: February 25, 1987Date of Patent: February 2, 1988Assignee: Chemical & Metal Industries, Inc.Inventor: David E. Hyatt
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Patent number: 4721610Abstract: Very small and uniform metal oxide particles are produced by a process including the steps of ejecting a metal vapor-containing gas into a metal-oxidizing region through a nozzle and ejecting a molecular oxygen-containing gas into the metal-oxidizing region through another nozzle in such a manner that the streams of the metal vapor-containing gas and the molecular oxygen-containing gas are smashed into each other to produce a turbulent flow diffusing flame in which the metal vapor is oxidized into very small and uniform metal oxide particles.Type: GrantFiled: November 18, 1985Date of Patent: January 26, 1988Assignee: UBE Industries, Ltd.Inventors: Kozaburo Yoshida, Akio Nishida, Akira Ueki
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Patent number: 4708763Abstract: The invention relates to a method of manufacturing bismuth germanate (Bi.sub.4 Ge.sub.3 O.sub.12) crystals using the Bridgman technique. A high degree of crystal perfection and an acceptable level of inclusions are obtained by changing the stoichiometry of the starting mixture in favor of Bi.sub.2 O.sub.3, such that the starting mixture contains between 40.2 and 40.5 mol. % of Bi.sub.2 O.sub.3 and between 59.8 and 59.5 mol. % of GeO.sub.2.Type: GrantFiled: December 9, 1986Date of Patent: November 24, 1987Assignee: U.S. Philips CorporationInventor: Leonardus A. H. van Hoof
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Patent number: 4684515Abstract: A single crystal is prepared by drawing up a single crystal by the Czochralski process and cooling it at a temperature not lower than 600.degree. C. in vacuo. In this manner a single crystal having a dislocation density of 1.5.times.10.sup.4 cm.sup.2 or less is prepared.Type: GrantFiled: April 24, 1985Date of Patent: August 4, 1987Assignees: Sumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Public Corp.Inventors: Akihisa Kawasaki, Kohji Tada, Toshihiro Kotani, Shintaro Miyazawa
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Patent number: 4678505Abstract: A continuous process for making a solid solution of two or more metals or metal oxides by ionic reaction and coprecipitation during high intensity mixing.Type: GrantFiled: November 24, 1986Date of Patent: July 7, 1987Assignee: E. I. Du Pont de Nemours and CompanyInventor: William R. Bushey
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Patent number: 4675171Abstract: Finely-divided particulate bismuth oxide is produced by the steps of heating bismuth at 800.degree. C. or above in a first compartment of a sealed vessel divided into two compartments by a partition wall, the two compartments communicating with each other by a hole provided on the partition wall, feeding an inert gas such as nitrogen and argon into the first compartment so that the bismuth vapor formed by heating bismuth has a bismuth concentration of 0.1 to 0.5 g/liter, blowing air into the bismuth vapor introduced from the first compartment into the second compartment through the hole on the partition wall, permitting the air to mix with the bismuth vapor to form bismuth oxide and simultaneously cooling the thus formed bismuth oxide to 250.degree. to 300.degree. C., discharging by suction the bismuth oxide from the sealed vessel at a flow rate of 1 to 5 m/sec, and cooling the discharged bismuth oxide by supplying cooling air outside the sealed vessel.Type: GrantFiled: December 5, 1985Date of Patent: June 23, 1987Assignee: Sumitomo Metal Mining Company LimitedInventors: Shigeki Kubo, Osamu Yamamoto
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Patent number: 4647404Abstract: A process for preparing a metamorphosed metal oxide, which comprises heating, under a non-oxidative (and not hydrogenous) atmosphere, a mixture of at least one metal oxide, said metal being selected from the group consisting of elements of Groups III, IV, V and II b and transition elements in Periodic Table, and a carbide represented by the formula:C(M).sub.zwherein M is an element except carbon selected from the group consisting of elements of Groups III, IV and V in Periodic Table, and Z is an integer corresponding to the valency of M, is disclosed. The process is simple and safe and the metamorphosed metal oxide obtained is modified in color tint and provided with electroconductivity.Type: GrantFiled: November 19, 1984Date of Patent: March 3, 1987Assignee: Otsuka Chemical Co., Ltd.Inventors: Takuo Morimoto, Kihachiro Nishiuchi, Kenichi Wada
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Patent number: 4629656Abstract: Ion exchange inorganic films made up of alpha-type or gamma-type layered structure insoluble acid salts of tetravalent metals or their salt forms, or their intercalated forms or their organic derivatives containing polar groups. A process for the preparation of said films.Type: GrantFiled: May 13, 1985Date of Patent: December 16, 1986Assignee: Consiglio Nazionale Delle RicercheInventors: Giulio Alberti, Umberto Costantino
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Patent number: 4610723Abstract: A process for lixiviation of concentrates of copper sulphides of tetrahedral type containing high concentration of arsenic and antimony to recover copper and noble metals. The concentrates are repulped into an aqueous ferrous sulphate solution with an established and controlled solid-liquid ratio which is thereafter oxidized by an oxygen containing gas in a reactor, thereby oxidizing the sulphides to sulphates, precipitating iron as ferric arsenates and antimoniates and yielding a lixiviation pulp in which the solid phase contains the iron, antimony and arsenic as well as the insoluble sulphates of the non-ferrous metals, such as lead and noble metals, and the liquid phase containing the copper, free sulphuric acid and the soluble sulphates of non-ferrous metals, as well as zinc, cadmium, cobalt, etc. The metals contained therein are recovered, after solid-liquid separation by conventional method.Type: GrantFiled: October 1, 1984Date of Patent: September 9, 1986Inventors: Eduardo D. Nogueira, Angel L. Redondo Abad