Group Iva Metal (ge, Sn, Or Pb) Patents (Class 423/89)
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Patent number: 7125536Abstract: This invention relates to a composition comprising nano-structured metal oxide particles (particularly, zirconia) and at least one stabilizing agent, a method to produce the composition, and a method to produce the thermally stable nano-structured particles. The method to produce the nano-structured particles comprises first preparing a base solution and a nanoparticle precursor solution, then combining these solutions at a final pH 7 or greater to precipitate a colloidal hydrous oxide. The colloidal hydrous oxide is then treated with at least one silicate, phosphate, or aluminum phosphate stabilizing agent and dried. These nano-structured particle products have high thermal stability and are particularly advantageous in applications as catalysts or catalyst supports that operate at high temperatures.Type: GrantFiled: February 6, 2004Date of Patent: October 24, 2006Assignee: Millennium Inorganic Chemicals, Inc.Inventors: Guoyi Fu, BillieJo Monk, Corinne Lehaut
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Patent number: 7122168Abstract: In a metal oxide nanoparticle and a synthetic method thereof, and in particular to maghemite (?-Fe2O3) nanoparticles usable as a superhigh density magnetic recording substance by having good shape anisotropy and magnetic characteristics, hematite (?-Fe2O3) nanoparticles usable as a precursor to the maghemite or a catalyst, maghemite and hematite-mixed nanoparticles and a synthetic method thereof, the method for synthesizing metal oxide nanoparticles includes forming a reverse micelle solution by adding distilled water, a surfactant and a solvent to metallic salt not less than trivalent, precipitating and separating gel type amorphous metal oxide particles by adding proton scavenger to the reverse micelle solution; adjusting a molar ratio of metal oxide to the surfactant by washing the gel type amorphous metal oxide particles with a polar solvent; and crystallizing metal oxide nanoparticles through heating or reflux after dispersing the gel type amorphous metal oxide particles in a non-polar solvent having a hType: GrantFiled: October 1, 2003Date of Patent: October 17, 2006Assignee: Korea Institute of Science and TechnologyInventors: Kyoungja Woo, Jae-Pyoung Ahn, Hae-Weon Lee
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Patent number: 7122164Abstract: Niobate-based octahedral molecular sieves having significant activity for multivalent cations and a method for synthesizing such sieves are disclosed. The sieves have a net negatively charged octahedral framework, comprising niobium, oxygen, and octahedrally coordinated lower valence transition metals. The framework can be charge balanced by the occluded alkali cation from the synthesis method. The alkali cation can be exchanged for other contaminant metal ions. The ion-exchanged niobate-based octahedral molecular sieve can be backexchanged in acidic solutions to yield a solution concentrated in the contaminant metal. Alternatively, the ion-exchanged niobate-based octahedral molecular sieve can be thermally converted to a durable perovskite phase waste form.Type: GrantFiled: May 1, 2003Date of Patent: October 17, 2006Assignee: Sandia CorporationInventors: Tina M. Nenoff, May D. Nyman
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Patent number: 7118727Abstract: The present invention provides a process for producing particles, such as oxide nanoparticles, in a substantially water-free environment. The process involves mixing at least one metal compound of the formula MX(m?n) with at least one surfactant and at least one solvent, wherein M is an electropositive element of Groups 1–15; each X is independently selected from the group consisting of O1/2, F, Cl, Br, I, OR, O2CR, NR2, and R; each R is independently a hydrocarbyl group; n is equal to ½ the oxidation state of the metal M in the product particle; and m is equal to the oxidation state of the element M. The components are typically combined to form a mixture which is thermally treated for a time period sufficient to convert the metal compound into particles of the corresponding oxide, having sizes in a range between about 0.5 nanometer and about 1000 nanometers.Type: GrantFiled: June 16, 2003Date of Patent: October 10, 2006Assignee: General Electric CompanyInventor: Darryl Stephen Williams
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Patent number: 6986873Abstract: A method of producing a single-phase composition Mn+1AzXn, primarily the production of the single-phase material Ti3SiC2, where n lies within a range of 0.8-3.2, where z lies within a range of 0.8-1.2, where M is at least one metal taken from the group of metals Ti (titanium), Sc (scandium), V (vanadium), Cr (chromium), Zr (zirconium), Nb (niobium) and Ta (tantalum), where X is at least one of the non-metals C (carbon) and N nitrogen), and where A is at least one of the chemical elements Si (silicon), Al (aluminum) and Sn (tin) or a compound of those elements, such that the final, desired compound will include the components Mn+1AzXn. A powder mixture of the components is formed and is ignited under an inert atmosphere to prevent promotion of dissociation and to cause the components to react.Type: GrantFiled: May 23, 2002Date of Patent: January 17, 2006Assignees: Sandvik AB, Drexel UniversityInventors: Mats Sundberg, Kjell Lindgren, Tamer El-Raghy, Michael Barsoum
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Patent number: 6953120Abstract: A method of recovering metal and/or oxide thereof from a slurry is described. The method involves magnetically separating at least a portion of any magnetic impurities from the slurry and then leaching or dissolving at least a portion of any remaining magnetic impurities in a slurry. At least one chelating agent can then be added to the slurry and the solids can be recovered from the slurry by various separation techniques. The methods of the present invention are particularly useful in the recovery of tantalum and/or oxide thereof especially tantalum and/or oxide thereof having a very fine size.Type: GrantFiled: February 8, 2002Date of Patent: October 11, 2005Assignee: Cabot CorporationInventors: Claude Deveau, Stephen R. Young
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Patent number: 6874335Abstract: Systems and methods for large scale synthesis of germanium selenide glass and germanium selenide glass compounds are provided. Up to about 750 grams of a germanium selenide glass or a glass compound can be synthesized at a time in about eight hours or less. Stoichiometrically proportional amounts of germanium and selenium are placed in an ampoule. A variable may also be placed in the ampoule. The ampoule is heated to above the softening temperature of the glass or glass compound being synthesized. The ampoule is then rocked for a period of time while the temperature is held constant. The temperature of the ampoule is then brought down to above the softening temperature of the glass or glass compound being synthesized and then quenched.Type: GrantFiled: April 12, 2002Date of Patent: April 5, 2005Assignee: Micron Technology, Inc.Inventor: Stefan Uhlenbrock
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Patent number: 6855527Abstract: A method of biotreating a solid material to remove an undesired compound using a nonstirred surface bioreactor is provided. According to the method, the surface of a plurality of coarse substrates is coated with a solid material to be biotreated to form a plurality of coated coarse substrates. The coarse substrates have a particle size greater than about 0.3 cm and the solid material to be biotreated has a particle size less than about 250 ?m. A nonstirred surface reactor is then formed by stacking the plurality of coated coarse substrates into a heap or placing the plurality of coated coarse substrates into a tank so that the void volume of the reactor is greater than or equal to about 25%. The solid material is biotreated in the surface bioreactor until the undesired compound in the solid material is degraded to a desired concentration.Type: GrantFiled: June 20, 2002Date of Patent: February 15, 2005Assignee: GeoBiotics LLCInventor: William J. Kohr
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Patent number: 6835332Abstract: A process for producing an electrode material for a rechargeable lithium battery, comprising the steps of mixing a metal compound (a) of a metal (a′) capable of being electrochemically alloyed with lithium, a transition metal compound (b) of a transition metal (b′) and a complexing agent (c) with a solvent (d) to obtain a mixed solution, mixing a reducing agent (e) with said mixed solution to obtain a mixture, and oxidizing said reducing agent in said mixture to reduce ion of said metal (a′) and ion of said transition metal (b′) to obtain an amorphous alloy material capable of being electrochemically alloyed with lithium as said electrode material. An electrode structural body in which said electrode material is used, and a rechargeable lithium battery in which said electrode material is used.Type: GrantFiled: March 13, 2001Date of Patent: December 28, 2004Assignee: Canon Kabushiki KaishaInventors: Tomoya Yamamoto, Soichiro Kawakami, Hiroya Umeyama
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Patent number: 6787117Abstract: There are provided a porous hollow fiber membrane capable of economically and efficiently recovering germanium which has heretofore been entirely disposed as a waste, and a method for recovery of germanium oxide using such a porous hollow fiber membrane.Type: GrantFiled: December 20, 2001Date of Patent: September 7, 2004Assignee: Asai Germanium Research Institute Co., Ltd.Inventors: Kyoichi Saito, Katuyuki Sato, Mitsuo Akiba
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Patent number: 6733559Abstract: A process for reducing plant availability of heavy metals in substrates such as soils wherein the substrates treated with cross-linked polymethacrylates. The poly (meth)acrylates can be worked into the soils.Type: GrantFiled: January 22, 2001Date of Patent: May 11, 2004Assignee: Stockhausen GmbHInventors: Aloys Hüttermann, Moitoba Zomorrodi
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Patent number: 6688811Abstract: A method for reducing the leaching of lead from a lead projectile impact area acting to collect or stop such projectiles includes contacting the lead projectile impact area with a seed of dry granular lead stabilizing agents. This seeding or coating of lead stabilizing agents stabilizes lead in the bullet/shot impact area while also allowing for future lead bullets, fragments or lead shot fired into the soil to be stabilized upon contact with the lead stabilizing agent seeds or contact with rainwater leaching through the lead stabilizing agent seeds produced from the projectile coating, or excess seed from the lead shell projectiles. This method eliminates the need to remove or re-treat range soils and greatly reduces the environmental and health risks associated with the use of lead as projectiles in the open environment as well as at control trap ranges.Type: GrantFiled: January 29, 2002Date of Patent: February 10, 2004Inventor: Keith E Forrester
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Patent number: 6656588Abstract: Doped, nanosize metal oxide particles have been shown to exhibit stimulated emission and continuous-wave laser action when energized appropriately, for example by electron beams. The doped particles are useful as solid state lasing devices and “laser paints”. Particles containing homogeneously distributed dopant atoms in concentrations greater than the thermodynamic solubility in the metal oxide matrix, and having in some circumstances, unusual oxidation states, have been produced.Type: GrantFiled: July 30, 2001Date of Patent: December 2, 2003Assignee: The Regents of the University of MichiganInventors: Richard M. Laine, Stephen C. Rand, Thomas Hinklin, Guy R. Williams
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Patent number: 6576696Abstract: A divalent metal stannate product having a loss on ignition of 2-17% by weight, e.g. a product intermediate ZnSn(OH)6 and ZnSnO3 has advantageous flame-retardant properties, for use e.g. in polymer formulations.Type: GrantFiled: April 5, 2000Date of Patent: June 10, 2003Assignee: Alcan International LimitedInventors: Consuelo Espejo Rodriguez, Clare Daniels, Robin Wainwright, Michael Rai
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Patent number: 6537510Abstract: One embodiment of the present invention provides a conductive pigment powder, which includes indium oxide, tin and gold, and having a purple color tone. Other embodiments of the present invention provide a method of producing a conductive pigment powder; a dispersion solution and a transparent conductive film, which include the above-mentioned conductive pigment powder; a method of forming a transparent conductive film; and a cathode ray tube, which includes the above-mentioned transparent conductive film and a transparent substrate.Type: GrantFiled: June 13, 2002Date of Patent: March 25, 2003Assignee: Mitsubishi Materials CorporationInventors: Toshiharu Hayashi, Hiroshi Yamaguchi, Daisuke Shibuta
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Patent number: 6533966Abstract: Suspensions and powders based on indium tin oxide are prepared by a method in which indium tin oxide precursors are precipitated from solutions in one or more solvents in the presence of one or more surface-modifying components, the solvent(s) are removed from the precipitate, which is then calcined, one or more surface-modifying components and one or more solvents are added, the mixture is comminuted or dispersed to form a suspension, and the liquid components are separated from the suspension to give a powder. The powder may be converted into a moulding by a shaping process. The materials prepared by this method are especially suitable as coating materials for use in microelectronics and optoelectronics.Type: GrantFiled: February 26, 2001Date of Patent: March 18, 2003Assignee: Institut für Neue Materialien gem. GmbHInventors: Ralph Nonninger, Christian Goebbert, Helmut Schmidt, Robert Drumm, Stefan Sepeur
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Patent number: 6517701Abstract: Aqueous solutions containing lead, zinc and manganese are treated to recover these metals by sequential solvent extraction steps. Solvent extractants are selected to extract preferentially lead, then zinc and then manganese in that order. Any interfering metals are removed (as by ion exchange) before extraction. The loaded extractant phases are stripped with selected acids and lead, zinc and manganese each recovered from the strip solutions. Optionally calcium can be recovered when present. A preferred type of extractant (for lead especially) is substituted monothiophosphinic acids. A closed loop system is described which is advantageous with leachate from sulphide and carbonate ores.Type: GrantFiled: August 14, 2001Date of Patent: February 11, 2003Assignee: Centaur Mining Exploration Ltd.Inventor: Robert A. Geisler
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Patent number: 6500779Abstract: This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V I VqMoAyOz II NiMoxByOz′ III VNiwMoxCy′Oz″ IV CoNiwMoxDyOz′″ V VNiwCorMoxEyOz″″ wherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and y′ is a number from 0 to 10, z, z′, z″, z′″, and z″″ are determined using the amounts and oxidation states of all cations present in each formula.Type: GrantFiled: June 11, 2001Date of Patent: December 31, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Kostantinos Kourtakis, John Donal Sullivan
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Patent number: 6475462Abstract: The present invention provides a process for treating a particulate material, in which particles of the material to be treated interact with non-static particles of a second material, the process comprising the steps of: (i) providing a processing chamber (1) having an inlet (7) and an outlet (10) spaced downstream therefrom, the base (15) of said chamber comprising a plurality of outwardly radiating inclined vanes (20, 25), (ii) providing a host bed of particles (30) which include inert particles, alumina, limestone and activated carbon in the chamber (1) and generating a flow of fluid through the vanes (20, 25) at the base (15) of the processing chamber such that the bed of host particles (30) circulates about an axis of the chamber in a compact band, (iii) injecting particles of the material to be treated including sulphide ore, kaolin, gypsum and talc through an inlet (5) of the chamber (1) to contact with the circulating bed of the host particles (30), wherein the relative terminal velocity of the particType: GrantFiled: March 28, 2000Date of Patent: November 5, 2002Assignee: Mortimer Technology Holdings LimitedInventors: Christopher Edward Dodson, Grant Ashley Wellwood
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Patent number: 6409978Abstract: A process for removing impurities contained in the crystal lattice of minerals, comprising the steps of forming a mixture of a mineral capable of structurally reorganizing its crystal lattice which contains an impurity in its crystal lattice and a halogen anion, and water; heating the mixture to the mineral's structural reorganization transition temperature; holding the mixture at the structural reorganization transition temperature for a sufficient period of time to allow the impurity to freely migrate from the lattice to combine with the halogen anion; and separating the combined impurity and anion from the mixture to render the mineral essentially free of the impurity. The process is applicable to numerous minerals and impurities, but is especially useful to remove arsenic from fluorspar. Numerous halogen anions can be employed, such as chlorides, fluorides, bromides and iodides, but the preferred halogen anion is a metal chloride such as calcium chloride.Type: GrantFiled: July 13, 2000Date of Patent: June 25, 2002Assignee: Svedala Industries, Inc.Inventors: Bobby P. Faulkner, John M. Paustian
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Patent number: 6383458Abstract: A process for the recovery of one or more metal values from a metal ore material comprising those of one or more values and a matrix material having a sulfur content wherein the sulfur is present in an oxidation-reduction state of zero or less comprising a. forming particulates from particles of said ore and an inoculate comprising bacteria capable of at least partially oxidizing the sulfur content; b. forming a heap of said particulates; c. biooxidizing the sulfur content and d. recovering those one or more metal values.Type: GrantFiled: June 2, 1995Date of Patent: May 7, 2002Assignee: Newmont Mining CorporationInventors: James A. Brierley, David L. Hill
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Patent number: 6350419Abstract: The present invention provides a novel process for the removal and recovery of metals from waste waters and process streams. The process of the present invention utilizes a combination of a supported liquid membrane (SLM) and a strip dispersion to improve extraction of the target species while increasing membrane stability and reducing processing costs. The process is illustrated with cobalt removal and recovery with unexpected results, such as unexpectedly high cobalt fluxes and a very high cobalt concentration in the strip solution recovered. This process can remove other metals, such as copper, zinc, nickel, mercury, lead, cadmium, silver, europium, lanthanum, neodymium, praseodymium, gadolinium, and selenium, from the feed stream to provide a concentrated strip solution of the target species.Type: GrantFiled: February 4, 2000Date of Patent: February 26, 2002Assignee: Commodore Separation Technologies Inc.Inventor: W. S. Winston Ho
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Patent number: 6267936Abstract: Solvent extraction of one or more metal ions from an aqueous solution in the presence of hydrocarbon-soluble aminomethylenephosphonic acid derivatives.Type: GrantFiled: March 29, 1999Date of Patent: July 31, 2001Assignees: BASF Aktiengesellschaft, Instituto National de Engenharia e TecnologiaInventors: Francisco Delmas, Carlos Nogueira, Michael Ehle, Knut Oppenländer
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Patent number: 6200377Abstract: An improved process for the beneficiation of mixtures of mineral particles (such as kaolin clays) containing minerals which chelate with hydroxamates. The use of a silicon-containing compound in combination with a hydroxamate results in a more effective separation of minerals which chelate with the hydroxamate.Type: GrantFiled: April 16, 1999Date of Patent: March 13, 2001Assignee: Thiele Kaolin CompanyInventors: Cesar I. Basilio, J. Michael Randolph
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Patent number: 6153156Abstract: A process for providing a leady oxide having reduced levels of undesired metallic impurities such as, for example, bismuth and/or silver, comprises roasting the leady oxide to convert part to orthorhombic PbO, exposing the roasted leady oxide to particle size reduction so that the tetragonal PbO can be separated from the orthorhombic PbO fraction, and recovering the orthorhombic fraction having the reduced level of impurities.Type: GrantFiled: August 2, 1999Date of Patent: November 28, 2000Assignee: GNB Technologies, Inc.Inventors: Michel M. F. Lawrence, Michael A. Kepros
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Patent number: 6146601Abstract: Isotopes of either germanium or silicon are separated by a chemical exchange reaction. Preferably the compound is a hydro halide or halide composition and the donor can be a wide variety of compounds such as a lower molecular weight alcohol.Type: GrantFiled: October 28, 1999Date of Patent: November 14, 2000Assignee: Eagle-Picher Industries, Inc.Inventors: Teimuraz Abesadze, William E. Saunders, Marvin Y. Wachs, Dennis K. Manning
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Patent number: 6090353Abstract: A process for removing impurities contained in the crystal lattice of minerals, comprising the steps of forming a mixture of a mineral capable of structurally reorganizing its crystal lattice which contains an impurity in its crystal lattice and a halogen anion, and water; heating the mixture to the mineral's structural reorganization transition temperature; holding the mixture at the structural reorganization transition temperature for a sufficient period of time to allow the impurity to freely migrate from the lattice to combine with the halogen anion; and separating the combined impurity and anion from the mixture to render the mineral essentially free of the impurity. The process is applicable to numerous minerals and impurities, but is especially useful to remove arsenic from fluorspar. Numerous halogen anions can be employed, such as chlorides, fluorides, bromides and iodides, but the preferred halogen anion is a metal chloride such as calcium chloride.Type: GrantFiled: April 1, 1998Date of Patent: July 18, 2000Assignee: Svedala Industries, Inc.Inventors: Bobby P. Faulkner, John M. Paustian
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Patent number: 6051517Abstract: A modified zeolite or molecular sieve membrane for separation of materials on a molecular scale. The modified membrane is fabricated to wholly or partially block regions between zeolite crystals to inhibit transfer of larger molecules through the membrane, but without blocking or substantially inhibiting transfer of small molecules through pores in the crystalline structure. The modified membrane has a monomolecular layer deposited on the zeolite surface which has coordinated groups of atoms that include (i) a metal atom bonded to oxygen atoms that are bonded to the zeolite substrate atoms (e.g., silicon atoms) and (ii) either hydroxyl groups bonded to the metal atoms or additional oxygen atoms bonded to the metal atoms.Type: GrantFiled: January 26, 1999Date of Patent: April 18, 2000Assignee: University Technology Corp.Inventors: Hans H. Funke, Jason W. Klaus, Steven M. George, Andrew W. Ott, John L. Falconer, Richard D. Noble
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Patent number: 6043177Abstract: A process for modifying surfaces of zeolites and molecular sieve membranes to decrease effective pore size for separation of materials includes atomic layer controlled vapor or liquid deposition. The atomic layer controlled deposition process steps include (i) exposing the surface to a metal atom coordinated with ligand groups having bonds that are hydrolyzable to form molecular bonded structures on the surface, which structures comprise the metal atoms coordinated with the ligand group or a modified ligand group and then (ii) hydrolyzing the bonds and possibly, but not necessarily, cross-linking the bonds in the ligand or modified ligand group.Type: GrantFiled: January 21, 1997Date of Patent: March 28, 2000Assignee: University Technology CorporationInventors: John L. Falconer, Steven M. George, Andrew W. Ott, Jason W. Klaus, Richard D. Noble, Hans H. Funke
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Patent number: 5945342Abstract: The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the adsorbed species without damage to or inadequate elution from the downstream chromatographic resins. The methods of the present invention involve contacting the loaded diphosphonic acid resin with concentrated oxidizing acid in a closed vessel, and irradiating this mixture with microwave radiation. This efficiently increases the temperature of the mixture to a level suitable for digestion of the resin without the use of dehydrating acids that can damage downstream analytical resins. In order to ensure more complete digestion, the irradiated mixture can be mixed with hydrogen peroxide or other oxidant, and reirradiated with microwave radiation.Type: GrantFiled: May 18, 1998Date of Patent: August 31, 1999Assignee: Westinghouse Savannah River CompanyInventors: Sherrod L. Maxwell, III, Sheldon T. Nichols
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Patent number: 5897688Abstract: The present invention relates to a method of removing a metal from a stream of hot gas, wherein a particulate material comprising calcium and aluminum-silicate is contacted in the hot gas to absorb metal present in the hot gas. According to the invention, a meta-kaolin-containing substance is introduced in the hot gas, said meta-kaolin-containing substance being formed by thermally converting a material chosen from the group of I) waste paper, and ii) residue from the paper industry. The invention may be used to remove metals before, during or after the combustion or gasification of fossil fuels, biomass and organic waste.Type: GrantFiled: April 18, 1997Date of Patent: April 27, 1999Assignee: CDEM Holland, BVInventors: Nicolaas Voogt, Joseph Jan Peter Biermann
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Patent number: 5894016Abstract: Method of preparing metal disulfides of the general formula(Sn.sub.x Me.sub.1-x)S.sub.2,whereinMe represents one or more of the elements Ti, Mo, Fe, Cr, Ta, Nb, Mn, Bi, W and Cu, andx can have values between 0.5 and 1,by mixing Sn, alone or with Me and/or Me sulfides, with a superstoichiometric quantity of S and reacting the same together, in the presence of halide compounds, in an exothermic reaction in an inert atmosphereand the further processing the disulfide product thereof to form dimetal trisulfides.Type: GrantFiled: April 18, 1997Date of Patent: April 13, 1999Assignee: H.C. Starck, GmbH & Co. KGInventor: Dietmar Fister
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Patent number: 5874374Abstract: A method for producing engineered materials from salt/polymer aqueous solutions in which an aqueous continuous phase having at least one metal cation salt is mixed with a hydrophilic organic polymeric disperse phase so as to form a metal cation/polymer gel. The metal cation/polymer gel is then treated to form a structural mass precursor, which structural mass precursor is heated, resulting in formation of a structural mass having predetermined characteristics based upon the intended application of the structural mass.Type: GrantFiled: September 8, 1997Date of Patent: February 23, 1999Assignee: Institute of Gas TechnologyInventor: Estela Ong
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Patent number: 5837209Abstract: Tin oxide whisker having a length of 0.1 to 100 .mu.m, a thickness of 0.005 to 5 .mu.m, and a ratio of the length to the thickness of at least 5, containing optionally a dopant such as antimony and bismuth, which contains no or few agglomerates and has excellent dispersibility in a matrix component.Type: GrantFiled: April 10, 1996Date of Patent: November 17, 1998Assignee: Sumitomo Chemical Company, LimitedInventor: Kunio Saegusa
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Patent number: 5698483Abstract: A process for producing nano size powders comprising the steps of mixing an aqueous continuous phase comprising at least one metal cation salt with a hydrophilic organic polymeric disperse phase, forming a metal cation salt/polymer gel, and heat treating the gel at a temperature sufficient to drive off water and organics within the gel, leaving as a residue a nanometer particle-size powder.Type: GrantFiled: March 17, 1995Date of Patent: December 16, 1997Assignee: Institute of Gas TechnologyInventors: Estela T. Ong, Vahid Sendijarevic
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Patent number: 5682593Abstract: Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.Type: GrantFiled: October 19, 1995Date of Patent: October 28, 1997Assignee: Bayer AktiengesellschaftInventors: Christoph Holzner, Hans-Dieter Block, Hans-Heinrich Moretto
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Patent number: 5527871Abstract: A layered inorganic-organic polymer having the features of both inorganic and organic materials and a coating material produced therefrom. The former is produced, for example, by reacting an organoalkoxysilane having alkoxyl groups and organic groups with a metal salt or alkoxide in an alkaline solution. This reaction yields a layered inorganic-organic polymer composed of one or two sheets of tetrahedrons with a central atom of Si or a metal and a sheet of octahedrons with a central atom of a metal, part or all of the central atoms of the tetrahedrons being covalently bonded to organic groups. If the organic group is one which contains a functional group capable of polymerization, the resulting layered inorganic-organic polymer may be polymerized with a functional group to give a firm coating material. The functional group of the organic group may be bonded to an organic compound.Type: GrantFiled: April 12, 1995Date of Patent: June 18, 1996Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Masaaki Tani, Yoshiaki Fukushima, Akane Okada, Katsuya Mizutani
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Patent number: 5491048Abstract: A process for removing tin from seasoned photographic color developers containing tin as stannous or stannate complex ions, comprising the steps of:(a) collecting seasoned photographic color developer containing tin;(b) treating the collected developer with a resin having a chelating group selected from the group consisting of diphosphonic acid, amidoxime and thiol, thereby removing tin from the composition.Type: GrantFiled: February 21, 1995Date of Patent: February 13, 1996Assignee: Eastman Kodak CompanyInventors: Ernest R. Anderson, Stephen N. Lowery
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Patent number: 5476613Abstract: A process for producing crystallites comprising silica and antimony containing tin oxide. The quantity of antimony within the tin oxide can be reduced, thereby permitting production a powder which is absent a blue coloration.Type: GrantFiled: March 25, 1994Date of Patent: December 19, 1995Assignee: E. I. du Pont de Nemours and CompanyInventor: Howard W. Jacobson
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Patent number: 5460791Abstract: A method of adsorbing and separating a heavy metal element by using a tannin adsorbent comprising:(a) adjusting the pH of a solution containing a plurality of heavy metal elements to a predetermined pH;(b) contacting the adsorbent with the solution in which the pH thereof is adjusted;(c) adjusting the pH of the solution contacted with the adsorbent to a pH different from the predetermined pH; and(d) contacting the solution in which the pH thereof is adjusted at the step (d) with the adsorbent prepared at the step (a).According to the inventive method, all of the heavy metal elements can be efficiently separated and adsorbed by using a tannin adsorbent from a solution containing a number of heavy metal elements. A method of regenerating a tannin adsorbent are also disclosed.Type: GrantFiled: August 10, 1992Date of Patent: October 24, 1995Assignee: Mitsubishi Nuclear Fuel Company, Ltd.Inventors: Wataru Shirato, Yoshinobu Kamei
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Patent number: 5461013Abstract: A process for the preparation of ceramic material Lithium stannate doped with a transition metal for a humidity sensor mixes a salt of Lithium with SnO.sub.2 in dry condition, thereafter mixes in wet conditions using an organic solvent, adds a transition metal compound to the resulting mixture, mixes the mixture thoroughly, drys and compacts the mixture in the range of 5000 to 8000 lbs and heats the pellets so formed at a temperature in the range of 600.degree. to 800.degree. C. for a period in the range of 6 to 12 hours followed by slow cooling to room temperature.Type: GrantFiled: March 30, 1994Date of Patent: October 24, 1995Assignee: Council of Scientific & Industrial ResearchInventors: Kunjukrishna P. Vijaymohan, Imtiaz S. Mulla, Parthasarathy Ganguly
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Patent number: 5430233Abstract: Solid residues arising from the reclamation of metal from, for example, insulated wires and automobiles, have lead (Pb) sufficiently insolubilized to pass the EPA toxicity test. Addition of water soluble phosphate, especially phosphoric acid, increases the immobilization of lead (Pb) so as to make such residues in compliance with the toxicity tests over a substantially broader pH range, particularly with respect to the more stringent TCLP extraction test.Type: GrantFiled: March 22, 1991Date of Patent: July 4, 1995Assignee: Wheelabrator Environmental Systems, Inc.Inventor: Keith E. Forrester
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Patent number: 5411667Abstract: A method of selectively separating lead ions from metal ions-containing aqueous liquid by contact with a solution containing a polyether derivative dissolved in a water-insoluble organic solvent and serving as an ionophore or carrier for lead ions. The polyether derivative is a compound expressed by the general formula: ##STR1## wherein R.sub.1 and R.sub.2 stand independently from each other for a hydrogen atom or an alkyl group and n is an integer of 2 or 3.Type: GrantFiled: August 3, 1994Date of Patent: May 2, 1995Assignee: Director-General of Agency of Industrial Science and TechnologyInventors: Kazuhisa Hiratani, Hideki Suigihara, Kazuyuki Kasuga
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Patent number: 5364566Abstract: A method for preparing a substantially white electroconductive powders by applying a surface coating comprising a two-dimensional network of antimony-containing tin oxide to amorphous silica or silica coated particles.Type: GrantFiled: February 12, 1993Date of Patent: November 15, 1994Assignee: E. I. Du Pont de Nemours and CompanyInventor: Howard W. Jacobson
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Patent number: 5342590Abstract: The invention provides a method of making alkali metal stannates which comprises heating a mixture of tin oxide with a solution of alkali under pressure. Preferably a stoichiometric excess of alkali over the tin is used.Type: GrantFiled: February 24, 1992Date of Patent: August 30, 1994Assignee: Alcan International LimitedInventor: David J. Randall
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Patent number: 5316683Abstract: Process for extracting Ge, Ga, In, As, Sb, Bi, Pt, Pd, Ni, and/or Co from an acid aqueous solution, wherein use is made of a resin with 8-hydroxyquinoline groups, resulting from the reaction of an aminated resin with an aldehyde and 8-hydroxyquinoline, characterized in that the aminated resin itself is obtained by imidoalkylation of a cross-linked styrene-copolymer and an ester or an ether of an N-hydroxyalkylimide and by hydrolysis of the imidoalkylation product.Type: GrantFiled: October 8, 1992Date of Patent: May 31, 1994Assignee: n.v. Union Miniere s.a.Inventors: Guy G. Haesebroek, Achille J. De Schepper
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Patent number: 5286464Abstract: Lead and cadmium ions are selectively removed and reclaimed from aqueous liquids containing the ions of these metals using an ion exchange resin which comprises a modified silica gel.Type: GrantFiled: June 14, 1993Date of Patent: February 15, 1994Assignee: Nalco Chemical CompanyInventor: Vera Dragisich
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Patent number: 5277883Abstract: A process is described for recovering metal values, e.g., gallium, contained in an aqueous solution by extraction comprising the steps of contacting the aqueous solution with a water immiscible organic phase comprising a water-insoluble substituted 8-hydroxyquinoline whereby the metal values are transferred into the organic phase; separating the organic phase from the aqueous solution and recovering the metal values from the organic phase. The novel feature comprises recovering the metal values by contacting the organic phase containing metal values with an aqueous solution of a strong base whereby metal values are removed from the organic phase to the aqueous solution with the aqueous solution containing the recovered metal values having a concentration of at least 4.6 moles per liter total hydroxide, and then separating the metal values from the aqueous phase.Type: GrantFiled: October 13, 1992Date of Patent: January 11, 1994Assignee: Rhone-Poulenc ChimieInventors: Gilles R. Turcotte, Sherri A. Finlayson
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Patent number: 5277882Abstract: A germanium bearing sulphate solution containing indium and/or gallium is brought at pH 1-2.5 into contact with an organic phase, containing a substituted 8-hydroxyquinoline and an acid organophosphorus compound. So, in addition to germanium, indium and gallium are also extracted from the sulphate solution.Type: GrantFiled: September 25, 1991Date of Patent: January 11, 1994Assignee: Union Miniere s.a.Inventors: Jean H. Vliegen, Guy G. Haesebroek, Achille J. De Schepper
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Patent number: 5209911Abstract: The present invention describes a method of making metal stannates by reacting a solid metal oxide, hydroxide or carbonate with an aqueous stannate solution and recovering the precipitated metal stannate, the solid component being added in an amount which is stoichiometrically not substantially more then the amount of tin.Type: GrantFiled: February 27, 1992Date of Patent: May 11, 1993Assignee: Alcan International LimitedInventor: David J. Randall