Zinc Patents (Class 423/622)
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Patent number: 7235224Abstract: Disclosed is a process for preparing fine metal oxide particles, comprising the following steps of reacting a reactant mixture comprising i) water, ii) at least one water-soluble metal nitrate and iii) ammonia or ammonium salt at 250–700° C. under 180–550 bar for 0.01 sec to 10 min in a reaction zone to synthesize the metal oxide particles, the metal nitrate being contained at an amount of 0.01–20 wt % in the reactant mixture; and separating and recovering the metal oxide particles from the resulting reaction products. According to the present invention, nano-sized metal oxide particles are synthesized, while the harmful by-products generated concurrently therewith are effectively decomposed in the same reactor.Type: GrantFiled: July 8, 2003Date of Patent: June 26, 2007Assignee: Han-Wha Chemical CorporationInventors: Wan-Jae Myeong, Jin-Soo Baik, Se-Woong Park, Chang-Mo Chung, Kyu-Ho Song
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Patent number: 7223377Abstract: The present invention is the method for preparation of transition metal oxide having micro-mesoporous structure whose average fine pores size is not less than 1 nm and not more than 2 nm comprising, adding and dissolving transition metal salt which is a precursor of transition metal oxide and/or metal alkoxide in the solution prepared by dissolving polymer surfactant in organic solvent, hydrolyzing said transition metal salt and/or metal alkoxide and preparing sol solution which is polymerized and self organized, then obtaining gel whose organization is stabilized from said sol solution and removing said polymer surfactant by using water of room temperature or water to which alkali metal or alkaline earth metal ion is added.Type: GrantFiled: October 2, 2002Date of Patent: May 29, 2007Assignee: Japan Science and Technology AgencyInventors: Kazunari Domen, Junko Nomura, Byonjin Ri
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Patent number: 7211230Abstract: The present invention discloses a process for producing nanometer powders, comprising the following steps: (a) providing reactant solution A and reactant solution B that can rapidly react to form precipitate; (b) continuously adding said solution A and solution B into a mixing and reacting precipitator with a stator and a rotor in operation, respectively; and (c) post-treating the precipitate-containing slurry discharged continuously from the mixing and reacting precipitator. The present process could produce nanometer powders with adjustable particle size, good homogeneity in size and good dispersity. The method also has the characteristics of high production yield, simplicity in process and low consumption of energy. It could be applied to produce various nanometer powders of metals, oxides, hydroxides, salts, phosphides and sulfides as well as organic compounds.Type: GrantFiled: March 5, 2002Date of Patent: May 1, 2007Assignee: Anshan University of Science and TechnologyInventors: Yingyan Zhou, Shoushan Gao, Hongxia Li, Kaiming Wang, Xiaoqi Li, Lixiang Li, Chuangeng Wen
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Patent number: 7198773Abstract: Disclosed are a method of fabricating ZnO nanostructures and its apparatus, and more particularly, to a method of fabricating ZnO nanostructures from Zn gas, which is produced by a reduction process between ZnO powder and graphite, on a silicon substrate, wherein various types of nanostructures are reproducibly generated by adjusting the processing temperature and the mixed ratio between oxygen and argon gases, which are introduced into the interior of a reaction tube as carrier gases, and its apparatus.Type: GrantFiled: July 30, 2003Date of Patent: April 3, 2007Assignee: Korea Institute of Science and TechnologyInventors: Jae-Hwan Park, Heon-Jin Choi, Jae-Gwan Park
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Patent number: 7182929Abstract: A method for producing nanostructured multi-component or doped oxide particles and the particles produced therein. The process includes the steps of (i) dissolving salts of cations, which are either dopants or components of the final oxide, in an organic solvent; (ii) adding a dispersion of nanoparticles of a single component oxide to the liquid solution; (iii) heating the liquid solution to facilitate diffusion of cations into the nanoparticles; (iv) separating the solids from the liquid solution; and (v) heat treating the solids either to form the desired crystal structure in case of multi-component oxide or to render the homogeneous distribution of dopant cation in the host oxide structure. The process produces nanocrystalline multi-component or doped oxide nanoparticles with a particle size of 5–500 nm, more preferably 20–100 nm; the collection of particles have an average secondary (or aggregate) particle size is in the range of 25–2000 nm, preferably of less than 500 nm.Type: GrantFiled: August 18, 2004Date of Patent: February 27, 2007Assignee: NEI, Inc.Inventors: Amit Singhal, Ganesh Skandan, Mohit Jain
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Patent number: 7138098Abstract: A method of manufacturing a nanocrystallite from a M-containing salt forms a nanocrystallite. The nanocrystallite can be a member of a population of nanocrystallites having a narrow size distribution and can include one or more semiconductor materials. Semiconducting nanocrystallites can photoluminesce and can have high emission quantum efficiencies.Type: GrantFiled: October 8, 2004Date of Patent: November 21, 2006Assignee: Massachusetts Institute of TechnologyInventors: Moungi Bawendi, Nathan E. Stott
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Patent number: 7135161Abstract: A method of forming metal oxide powders includes the steps of solid state mixing of at least one metal nitrate salt, such as Fe(NO3)3 or a combination of metal nitrate salts such as Zn(NO3)3,6H2O and Ga(NO3)3, xH2O, and at least one reducing organic acid, such as tartaric or citric acid. The mixture is heated to form a metal oxide powder, such as alpha-iron oxide (?-Fe2O3) or a mixed metal powder such as zinc gallate phosphor (ZnGa2O4). A metal oxide precursor intermediate can be formed and then heated to form the metal oxide powder.Type: GrantFiled: September 4, 2003Date of Patent: November 14, 2006Assignee: University of Florida Research Foundation, Inc.Inventors: Paul H. Holloway, Mostafa Abboudi
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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: 7118726Abstract: A method of making an oxide compound, comprising subjecting a base material to a source of heat that produces a localized temperature in the range of 2,000 to 5,500 degrees Celsius that vaporizes the base material which is drawn upward above the surface of the base material where it oxidizes, after which the resulting oxide compound is collected. A method of making bismuth trioxide, comprising providing an electric arc between electrodes, wherein elemental bismuth is in touching proximity to one of the electrodes. The bismuth is evaporated, drawn upward off the surface of the molten metal, forms the bismuth oxide on contact with oxygen, and the particles of bismuth oxide are collected. A method of making an oxide using an electric arc to evaporate a base material which then reacts with oxygen, and collecting the resulting oxides of base material.Type: GrantFiled: April 4, 2003Date of Patent: October 10, 2006Assignee: Clark Manufacturing, LLCInventors: Jeffrey W. Clark, Larry B. Hunnel
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Patent number: 7090821Abstract: The present invention relates to a metal oxide powder for high precision polishing and prepartion thereof, comprising aggregates formed by cohesion of primary particles, which has a cohesive degree (?) of 1.1 to 2.0 and a cohesive scale (?) of 3 to 10, the cohesive degree (?) and the cohesive scale (?) being defined by formula (I) and formula (II), respectively: ?=6/(S×?×d(XRD)) ??(I) ?=weight average particle diameter/d(XRD) ??(II) wherein, S is the specific surface area of the powder; ?, the density; and d(XRD), the particle diameter of the powder determined by X-ray diffraction analysis. In accordance with the present invention, it is possible to provide a high polishing speed and reduce scratches.Type: GrantFiled: June 5, 2003Date of Patent: August 15, 2006Assignee: Samsung Corning Co., Ltd.Inventors: Hyukjin Kwon, Myungho Ahn, Youngkwon Joung, Inyeon Lee
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Patent number: 7081234Abstract: A process of treating metal oxide nanoparticles that includes mixing metal oxide nanoparticles, a solvent, and a surface treatment agent that is preferably a silane or siloxane is described. The treated metal oxide nanoparticles are rendered hydrophobic by the surface treatment agent being surface attached thereto, and are preferably dispersed in a hydrophobic aromatic polymer binder of a charge transport layer of a photoreceptor, whereby ?—? interactions can be formed between the organic moieties on the surface of the nanoparticles and the aromatic components of the binder polymer to achieve a stable dispersion of the nanoparticles in the polymer that is substantially free of large sized agglomerations.Type: GrantFiled: April 5, 2004Date of Patent: July 25, 2006Assignee: Xerox CorporationInventors: Yu Qi, Nan-Xing Hu, Ah-Mee Hor, Cheng-Kuo Hsiao, Yvan Gagnon, John F. Graham
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Patent number: 7022303Abstract: Polycrystalline materials of macroscopic size exhibiting Single-Crystal-Like properties are formed from a plurality of Single-Crystal Particles, having Self-Aligning morphologies and optionally ling morphology, bonded together and aligned along at least one, and up to three, crystallographic directions.Type: GrantFiled: May 13, 2002Date of Patent: April 4, 2006Assignee: Rutgers, The State UniversityInventors: Richard E. Riman, Larry E. McCandlish
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Patent number: 6992038Abstract: The present invention is to solve the problems caused by a conventional method for producing a zinc chloride-loaded support wherein zinc chloride is adsorbed on a solid support in an aqueous solution of zinc chloride. The problems include environmental destruction caused by the treatment of a used aqueous solution of zinc chloride, corrosion to a reactor, a threat to health for workers, deterioration of zinc chloride due to deliquescence thereof, and reduction of specific surface area.Type: GrantFiled: November 18, 2003Date of Patent: January 31, 2006Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Mitsuo Narita, Masaki Tabata, Kazuhisa Hayakawa
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Patent number: 6984369Abstract: Disclosed is a process for making surfactant capped nanocrystals of metal oxides which are dispersable in organic solvents. The process comprises decomposing a metal cupferron complex of the formula MXCupX, wherein M is a metal, and Cup is a N-substituted N-Nitroso hydroxylamine, in the presence of a coordinating surfactant, the reaction being conducted at a temperature ranging from about 150 to about 400° C., for a period of time sufficient to complete the reaction. Also disclosed are compounds made by the process.Type: GrantFiled: November 22, 2000Date of Patent: January 10, 2006Assignee: The Regents of the University of CaliforniaInventors: A. Paul Alivisatos, Joerg Rockenberger
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Patent number: 6942728Abstract: The present invention is embodied in high performance p-type thermoelectric materials having enhanced thermoelectric properties and the methods of preparing such materials. In one aspect of the invention, p-type semiconductors of formula Zn4?xAxSb3?yBy wherein 0?x?4, A is a transition metal, B is a pnicogen, and 0?y?3 are formed for use in manufacturing thermoelectric devices with substantially enhanced operating characteristics and improved efficiency. Two methods of preparing p-type Zn4Sb3 and related alloys of the present invention include a crystal growth method and a powder metallurgy method.Type: GrantFiled: October 1, 2002Date of Patent: September 13, 2005Assignee: California Institute of TechnologyInventors: Thierry Caillat, Alexander Borshchevsky, Jean-Pierre Fleurial
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Patent number: 6936188Abstract: A zinc oxide semiconductor material comprising at least zinc and oxygen as constituent elements, which can be deterred with respect to the deterioration of doping characteristic, luminous characteristic and the like, compared with a conventional c-axial oriented one by orienting the crystal orientation plane to a-axis of the wurtzite structure.Type: GrantFiled: March 27, 2000Date of Patent: August 30, 2005Assignees: Tohoku Techno Arch Co., Ltd., Sumitomo Electric Industries, Ltd.Inventor: Koichi Haga
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Patent number: 6869596Abstract: A UV screening composition comprising particles which are capable of absorbing UV light so that electrons and positively charged holes are formed within the particles, characterised in that the particles are adapted to minimise migration to the surface of the particles of the electrons and/or the positively charged holes when said particles are exposed to UV light in an aqueous environment.Type: GrantFiled: May 27, 1999Date of Patent: March 22, 2005Assignee: ISIS Innovation LimitedInventors: John Sebastian Knowland, Peter James Dobson, Gareth Wakefield
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Patent number: 6863873Abstract: A hydrometallurgical process utilizing an atmospheric calcium chloride leach to selectively recover from various metal feed stocks (consisting of elemental metals, metal oxides, metal ferrite, metal hydroxide, metal carbonates, metal sulfate/sulfur compounds, and their hydrates, specifically including but not limited to EAF Dust K061) zinc, lead, cadmium, silver, copper and other valuable metals to the exclusion of iron, magnesium, halogen salts and other unwanted elements. The process solves the problem of iron and magnesium leach solution contamination because iron is unexpectedly converted to magnetite. The heavy metals are cemented out of solution using zinc or other selected dust at a pH of 6 or greater under unique and unexpected conditions, which do not require acid.Type: GrantFiled: September 23, 2003Date of Patent: March 8, 2005Inventors: Loren P. Hoboy, Nick A. Wolf, Tonya F. Yoder
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Patent number: 6843976Abstract: An apparatus and a process for producing zinc oxide from a zinc-bearing material are provided. The process comprises the steps of leaching the complex sulfide material with hydrochloric acid, ferric chloride, and oxygen; precipitating iron from the leach solution using lime and oxygen; removing copper, silver, cadmium, cobalt and lead from the leach solution by cementation with zinc dust; precipitating zinc oxide from the leach solution using lime; and regenerating HCl from a calcium chloride leach filtrate solution to regenerate hydrochloric acid and precipitate gypsum. Related processes for recovering copper, silver, lead, and iron from complex sulfide materials and for recovering lead from residue by solubilizing lead chloride and precipitating it with lime are also provided.Type: GrantFiled: February 27, 2001Date of Patent: January 18, 2005Assignee: Noranda Inc.Inventors: Carole Allen, Serge Payant, Peter Kondos, Gezinus Van Weert
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Patent number: 6841143Abstract: This invention provides mesostructured oxide ceramics and a synthesizing method thereof, the synthesizing method employs a water-based solvent containing a metallic salt or metal complex as the ceramics precursor, template formed from an organic compound or the association thereof, and a precipitant, wherein mesostructured oxide ceramics are obtained from self-assembled oxide ceramics and organic substance by directly extracting oxide ceramics at a low temperature of 200° C. or less by utilizing a homogenous precipitation reaction from said ceramics precursor under the coexistence of a nanometer-sized template in the solvent, and separating and collecting the obtained precipitation, and mesostructured oxide ceramics is prepared by employing the synthesizing method described above.Type: GrantFiled: September 6, 2001Date of Patent: January 11, 2005Assignee: National Institute of Advanced Industrial Science and TechnologyInventors: Masahiko Inagaki, Atsushi Hozumi, Kei Teraoka, Kaori Nishizawa, Fukue Nagata, Yoshiyuki Yokogawa, Tetsuya Kameyama
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Patent number: 6841000Abstract: Aqueous mineralizer solutions having retrograde solubility for ZnO contain a mineral acid in which ZnO is soluble and at least one compound of a coordinating ligand for Zn2+ ions wherein the coordinating ligand compound is present in an amount that is effective to inhibit Zn(OH)+ ion formation as ZnO is dissolved in the solution. Reduced temperature methods using the mineralizer solutions to grow pure or doped ZnO crystals, pure or doped ZnO thick or thin films, and pure or doped ZnO crystalline powders are also disclosed. Cation doped ZnOs prepared by the inventive methods are also disclosed.Type: GrantFiled: October 1, 2002Date of Patent: January 11, 2005Assignee: Ceramare CorporationInventors: Larry Eugene McCandlish, Robert Uhrin
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Publication number: 20040241085Abstract: The present invention provides a process for preparing ball-shaped zinc oxide particles and their use.Type: ApplicationFiled: May 28, 2004Publication date: December 2, 2004Inventors: Thiemo Marx, Bernd Hynek, Volker Wege
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Patent number: 6800135Abstract: A ZnO/sapphire substrate includes an R-plane sapphire substrate whose (0 1-1 2) planes are parallel to the surface thereof and a ZnO epitaxial film formed on the R-plane sapphire substrate. The (1 1-2 0) planes of the ZnO epitaxial film are disposed with an interplanar spacing in the range of about 1.623 to 1.627 Å parallel to the (0 1-1 2) planes of the R-plane sapphire substrate.Type: GrantFiled: June 17, 2002Date of Patent: October 5, 2004Assignee: Murata Manufacturing Co., Ltd.Inventors: Jun Koike, Hideharu Ieki
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Patent number: 6783744Abstract: A method for the recovery of high purity zinc oxide products, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc oxide and/or iron. The waste streams preliminary can be treated by adding carbon and an ammonium chloride solution, separating any undissolved components from the solution, displacing undesired metal ions from the solution using zinc metal, treating the solution to remove therefrom zinc compounds, and further treating the zinc compounds and the undissolved components, as necessary, resulting in the zinc products and the optional iron-carbon feedbacks. Once the zinc oxide has been recovered, the purification process is used to further purify the zinc oxide to obtain zinc oxide which is at least 99.8% pure and which has predeterminable purity and particle characteristics. Various zinc compounds may then be quickly, easily, and economically produced from this recovered zinc oxide.Type: GrantFiled: August 27, 2003Date of Patent: August 31, 2004Inventors: Allan S Myerson, Peter Robinson, Stephan Tabah
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Patent number: 6780393Abstract: A method of producing fine particles of an oxide of a metal, comprising the steps of: preparing an acidic solution which contains ions of the metal; precipitating fine particles of a hydroxide of the metal by adding an alkaline solution to the acidic solution; collecting the fine particles of the hydroxide of the metal precipitated in a mixed solution of the acidic solution and the alkaline solution; mixing fine particles of a carbon with the collected fine particles of the hydroxide of the metal; and heat-treating a mixture of the fine particles of the hydroxide of the metal and the fine particles of the carbon at a predetermined temperature in a non-reducing atmosphere, whereby the fine particles of the oxide of the metal are produced.Type: GrantFiled: December 14, 2001Date of Patent: August 24, 2004Assignees: National Institute of Advanced Industrial Science and Technology, Noritake Co., LimitedInventors: Norimitsu Murayama, Woosuck Shin, Sumihito Sago, Makiko Hayashi
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Publication number: 20040115533Abstract: A zinc electrode for use in alkaline batteries comprises a mixture of 0.425 to 1.55 volume parts of zinc oxide with a volume part of a metallic oxide chosen from the group consisting of: calcium oxide, barium oxide, and mixtures thereof, together with hydroxy-ethyl cellulose, an oxide dispersant chosen from the group consisting of: soap derivatives, anionic polyelectrolytes, anionic surfactants, and mixtures thereof, and a binder. The electrode is prepared by mixing zinc oxide with the chosen metallic oxide in an aqueous medium such as water or potassium hydroxide, stirring overnight, filtering and drying the mixture, optionally adding a further small amount of zinc oxide, optionally adding other metallic oxides, and adding hydroxy-ethyl cellulose, an oxide dispersant, and a binder. The aqueous paste os slurry thus formed is placed on a conductive substrate, drawn through a sizing gap, cut and dried, to form low cost pasted zinc oxide electrodes.Type: ApplicationFiled: January 20, 2004Publication date: June 17, 2004Inventor: Jeffrey Phillips
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Publication number: 20040115123Abstract: The present invention discloses a process for producing nanometer powders, comprising the following steps: (a) providing reactant solution A and reactant solution B that can rapidly react to form precipitate; (b) continuously adding said solution A and solution B into a mixing and reacting precipitator with a stator and a rotor in operation, respectively; and (c) post-treating the precipitate-containing slurry discharged continuously from the mixing and reacting precipitator. The present process could produce nanometer powders with adjustable particle size, good homogeneity in size and good dispersity. The method also has the characteristics of high production yield, simplicity in process and low consumption of energy. It could be applied to produce various nanometer powders of metals, oxides, hydroxides, salts, phosphides and sulfides as well as organic compounds.Type: ApplicationFiled: February 6, 2004Publication date: June 17, 2004Inventors: Yingyan Zhou, Shoushan Gao, Hongxia Li, Kaiming Wang, Xiaoqi Li, Lixiang Li, Chuangeng Wen
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Patent number: 6730518Abstract: Disclosed is a method of reducing photooxidation or air oxidation in susceptible materials such as food, plastics or pharmaceuticals comprising mixing the material with an antioxidation composition comprising at least one amino acid, at least one metal ion, and at least one carboxylic acid in an amount effective to reduce photooxidation in the material.Type: GrantFiled: September 25, 2000Date of Patent: May 4, 2004Assignee: Natura, Inc.Inventors: Joel I. Dulebohn, Ronald J. Carlotti
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Patent number: 6719821Abstract: The production and selection of precursor mixtures used to produce fine powders and methods for making fine powders using the selected precursor. The precursor mixture comprises at least one metal containing precursor, the metal containing precursor has an average molecular weight of less than 2000 grams per unit mol of the metal, the metal containing precursor has a normal boiling point greater than 350K, and the viscosity of the precursor mixture is between 0.1 to 250 cP. The precursor mixture is processed under conditions that produce a fine powder from the precursor mixture. Fine powders produced are of size less than 100 microns, preferably less than 10 micron, more preferably less than 1 micron, and most preferably less than 100 nanometers.Type: GrantFiled: February 8, 2002Date of Patent: April 13, 2004Assignee: NanoProducts CorporationInventors: Tapesh Yadav, Elena Mardilovich
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Patent number: 6710091Abstract: A method for the preparation of nano size zinc oxide particles having an average primary particle diameter of less than or equal to 15 nm, which are redispersible in organic solvents and/or water, by basic hydrolysis of at least one zinc compound in alcohol or an alcohol/water mixture. The hydrolysis is carried out with substoichiometric amounts of base, based on the zinc compound. The precipitate which originally forms during hydrolysis is left to mature until the zinc oxide has completely flocculated. This precipitate is then thickened to give a gel and separated off from the supernatant phase.Type: GrantFiled: August 21, 2001Date of Patent: March 23, 2004Assignee: Bayer AktiengesellschaftInventors: Hermann-Jens Womelsdorf, Werner Hoheisel, Gerd Passing
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Patent number: 6706220Abstract: In the mixture of metal and/or alloy particles and a liquid electrolytic medium, the metal and/or alloy particles are irregularly shaped, have a non-uniform surface and a bulk density of below 33% by weight of the specific density of the compact metal and/or the compact alloy, and the volume of the medium is larger than that which corresponds to the spaces between the particles in a dry packing.Type: GrantFiled: March 11, 2002Date of Patent: March 16, 2004Assignee: Grillo-Werke AGInventor: Wolfgang Glaeser
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Patent number: 6703006Abstract: A deodorant composition for topical application, which comprises a plurality of particles dispersed and a carrier, each particle comprising a glass microsphere at least partially coated with zinc oxide, a zinc salt, or any mixture of two or more thereof.Type: GrantFiled: August 23, 2001Date of Patent: March 9, 2004Assignee: The Gillette CompanyInventors: Brian Edward Causton, Sydney Christopher Tavern
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Patent number: 6696029Abstract: A method for the recovery of high purity zinc oxide products, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc oxide and/or iron. The waste streams preliminary can be treated by adding carbon and an ammonium chloride solution, separating any undissolved components from the solution, displacing undesired metal ions from the solution using zinc metal, treating the solution to remove therefrom zinc compounds, and further treating the zinc compounds and the undissolved components, as necessary, resulting in the zinc products and the optional iron-carbon feedbacks. Once the zinc oxide has been recovered, the purification process is used to further purify the zinc oxide to obtain zinc oxide which is at least 99.8% pure and which has predeterminable purity and particle characteristics. Various zinc compounds may then be quickly, easily, and economically produced from this recovered zinc oxide.Type: GrantFiled: January 29, 1996Date of Patent: February 24, 2004Inventors: Allan S Myerson, Peter Robinson, Stephan Tabah
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Patent number: 6627100Abstract: A current/voltage non-linear resistor comprises a sintered body having a main component of ZnO, an electrode applied to a surface of the sintered body and an insulation material applied to another surface of the sintered body. The main component containing, as auxiliary components, Bi, Co, Mn, Sb, Ni and Al, and the contents of the auxiliary components are respectively expressed as Bi2O3, Co2O3, MnO, Sb2O3, NiO and Al3+, of Bi2O3: 0.3 to 2 mol %, Co2O3: 0.3 to 1.5 mol %, MnO: 0.4 to 6 mol %, Sb2O3: 0.8 to 7 mol %, NiO: 0.5 to 5 mol % and Al3+: 0.001 to 0.02 mol %; a Bi2O3 crystalline phase in the sintered body including an &agr;-Bi2O3 phase representing at least 80% of the total Bi2O3 phase.Type: GrantFiled: April 25, 2001Date of Patent: September 30, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Hideyasu Ando, Takeshi Udagawa, Yoshiyasu Ito, Hironori Suzuki, Hiroyoshi Narita, Koji Higashibata, Toshiya Imai, Kiyokazu Umehara, Yoshikazu Tanno
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Patent number: 6627173Abstract: A process for the preparation of doped, pyrogenically prepared titanium dioxide is described. The titanium dioxide is doped with zinc oxide, platinum oxide, magnesium oxide, or aluminium oxide, by injecting an aerosol of the oxide into the production stream. The doped titanium dioxide may be used as a photocatalyst or UV absorber.Type: GrantFiled: March 27, 2001Date of Patent: September 30, 2003Assignee: Degussa AGInventors: Ina Hemme, Helmut Mangold, Sven-Uwe Geissen, Anna Moiseev
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Publication number: 20030114296Abstract: During regeneration of a sulfurized sorbent, the oxygen partial pressure in the regeneration zone is controlled to minimize sulfation of the sorbent.Type: ApplicationFiled: December 19, 2001Publication date: June 19, 2003Inventors: Jason J. Gislason, Ronald E. Brown, Robert W. Morton, Glenn W. Dodwell
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Patent number: 6555075Abstract: A method for preparing basic zinc carbonate from die casting ash, zinc skimming or zinc ash includes heating urea or a mixture of urea and ammonia and carbon dioxide with water in a closed vessel with zinc ash. After zinc is dissolved in sufficient quantities, the solution is cooled and filtered. The filtered solution is cemented with zinc dust to precipitate heavy metals and the filtered. The solution is preferably heated a second time to remove an iron precipitate. The solution is then heated a third time to precipitate the dissolved zinc as basic zinc carbonate, which is washed and dried. The filtrate and gases recovered from the heating steps are reused in the process.Type: GrantFiled: May 23, 2001Date of Patent: April 29, 2003Inventor: Raymond Lee Nip
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Publication number: 20030057105Abstract: The present invention provides a composition comprising a saturated solution of zinc oxide in an aqueous sodium or potassium hydroxide solution wherein the concentrations of the zinc oxide and the sodium hydroxide in said solution are as set forth in FIG. 1, and the concentrations of the zinc oxide and potassium hydroxide are as set forth in FIG. 2.Type: ApplicationFiled: September 27, 2001Publication date: March 27, 2003Applicant: Clariant International Ltd.Inventors: Baldev K. Bandlish, Vincent Wise Martin
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Patent number: 6517789Abstract: An industrial waste stream recycling method for recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams containing zinc compounds by leaching the waste stream with a solution of 30% or greater by weight ammonium chloride, resulting in a first product solution and undissolved materials; adding zinc metal to the first product solution, whereby zinc-displaceable metal ions contained in the first product solution are displaced by the zinc metal and precipitate out of the first product solution as metals, leaving a second product solution; and diluting the second product solution with water, resulting in the precipitation of zinc oxide.Type: GrantFiled: April 30, 2001Date of Patent: February 11, 2003Inventors: Allan S. Myerson, Peter Robinson
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Patent number: 6517802Abstract: A chemical synthetic route for nanostructured materials that is scalable to large volume production, comprising spray atomization of a reactant solution into a precursor solution to form a nanostructured oxide or hydroxide precipitate. The precipitate is then heat-treated followed by sonication, or sonicated followed by heat treatment. This route yields nanostructured doped and undoped nickel hydroxide, manganese dioxide, and ytrria-stabilized zirconia. Unusual morphological superstructures may be obtained, including well-defined cylinders or nanorods, as well as a novel structure in nickel hydroxide and manganese dioxide, comprising assemblies of nanostructured fibers, assemblies of nanostructured fibers and agglomerates of nanostructured particles, and assemblies of nanostructured fibers and nanostructured particles. These novel structures have high percolation rates and high densities of active sites, rendering them particularly suitable for catalytic applications.Type: GrantFiled: September 15, 2000Date of Patent: February 11, 2003Assignees: The University of Connecticut, Rutgers, The State University of New JerseyInventors: Tongsan D. Xiao, Peter R. Strutt, Bernard H. Kear, Huimin Chen, Donald M. Wang
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Patent number: 6497830Abstract: An ultraviolet light absorber containing, as an active ingredient, a zinc oxide type solid solution which is represented by the formula (1), (Zn)1−xM3+x−&dgr;O (1) wherein M3+ is a trivalent metal such as Al, Fe, Ce or Ti, x is a number in the range of 0<x<=0.2, and &dgr; is a cationic lattice defect, and has an average secondary particle diameter of from 0.1 to 1.5 &mgr;m in a plate form and a BET specific surface area of at least 5 m2/g, an ultraviolet light resistant resin composition containing a resin and the above zinc oxide type solid solution and a sun block cosmetic material containing the above zinc oxide type solid solution.Type: GrantFiled: March 14, 2001Date of Patent: December 24, 2002Assignee: Kabushiki Kaisha Kaisui Kagaku KenkyujoInventor: Shigeo Miyata
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Patent number: 6468498Abstract: A composite metal material of formula (I) are stable and not deteriorated for a long time and have excellent activities in photolyzing water with visible light: x(A)y(B)z(C)-p(P)n(N) (I) wherein, (A) is Pb(Mg1/3Nb2/3)O3 or Pb(Zn1/3Nb2/3)O3, (B) is PbTiO3, (C) is LiTaO3, (P) is a metal selected from the group consisting of Pt, Au, Ag, Pd and Rh, (N) is an oxide of a metal selected from the group consisting of Ni, Co, Fe, Sr, Sc, Ru, Cu and Cd, x is a number in the range of 0.65 to 0.98, y is a number in the range of 0.01 to 0.34, z is a number in the range of 0.01 to 0.1, and p and n are each independently a number in the range of 0.01 to 5.Type: GrantFiled: May 25, 2001Date of Patent: October 22, 2002Assignee: Idbule Photonics Co., Ltd.Inventors: Sang-Goo Lee, Min-Chan Kim, Gil-Seon Kang, Wha-Young Lee, In-Kyu Song, Young-Gwan Ko
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Publication number: 20020139688Abstract: A process for producing a zinc oxide acicular structure by growing an acicular zinc oxide on a substrate, the process comprising the steps of holding the substrate in an electrolytic solution in which at least zinc ions are present, and forming zinc oxide on the substrate by electrodeposition. The electrolytic solution contains at least one cosolute. Also disclosed is a photoelectric conversion device comprising a charge transport layer having the zinc oxide acicular structure.Type: ApplicationFiled: March 20, 2002Publication date: October 3, 2002Inventors: Hiroshi Okura, Tohru Den, Kaoru Konakahara
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Patent number: 6458319Abstract: The present invention is embodied in high performance p-type thermoelectric materials having enhanced thermoelectric properties and the methods of preparing such materials. In one aspect of the invention, p-type semiconductors of formula Zn4−xAxSb3−yBy wherein 0≦x≦4, A is a transition metal, B is a pnicogen, and 0≦y≦3 are formed for use in manufacturing thermoelectric devices with substantially enhanced operating characteristics and improved efficiency. Two methods of preparing p-type Zn4Sb3 and related alloys of the present invention include a crystal growth method and a powder metallurgy method.Type: GrantFiled: March 18, 1997Date of Patent: October 1, 2002Assignee: California Institute of TechnologyInventors: Thierry Caillat, Alexander Borshchevsky, Jean-Pierre Fleurial
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Patent number: 6365555Abstract: A process for the preparation of nanostructured materials in high phase purities using cavitation is disclosed. The method comprises mixing a metal containing solution with a precipitating agent and passing the mixture into a cavitation chamber. The chamber consists of a first element to produce cavitation bubbles, and a second element that creates a pressure zone sufficient to collapse the bubbles. The process is useful for the preparation of mixed metal oxide catalysts and materials for piezoelectrics and superconductors.Type: GrantFiled: October 25, 1999Date of Patent: April 2, 2002Assignee: Worcester Polytechnic InstituteInventors: William R. Moser, Oleg V. Kozyuk, Josef Find, Sean Christian Emerson, Ivo M. Krausz
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Patent number: 6350946Abstract: A photoelectric conversion device having a photosensitive layer comprising semiconductor particles is disclosed, in which the semiconductor particles are obtained from a metal hydroxide gel or a precursor thereof present in a hydrophilic solvent. Also disclosed in a photoelectric cell including the photoelectric conversion device.Type: GrantFiled: September 11, 2000Date of Patent: February 26, 2002Assignee: Fuji Photo Film Co., Ltd.Inventors: Kiyoteru Miyake, Tadao Sugimoto
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Publication number: 20010013362Abstract: Provided are a zinc oxide thin film having an X-ray diffraction peak of the plane of zinc oxide crystal, a photoelectric conversion element having the zinc oxide thin film, and production processes thereof. By these, the texture level of the zinc oxide thin film is increased and the photoelectric conversion element is provided with excellent short circuit current density (Jsc).Type: ApplicationFiled: April 6, 2001Publication date: August 16, 2001Inventor: Takaharu Kondo
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Patent number: 6267949Abstract: The invention provides a sunscreen formulation including conventional UVB sunscreening agents and zinc oxide having an average particle size in the order of 150 to 800 nm. Preferably the zinc oxide used is pigment grade. Most preferably, zinc oxide prepared by the French process is used, although that produced by the American process is also suitable. The average particle size of the zinc oxide is most preferably in the order of 200-400 nm. Throughout this specification, the term “pigment grade” is used to define zinc oxide that has been produced by the French or American process. A further embodiment of the invention is a method of reducing or preventing the harmful effects of solar radiation on skin by applying inventive sunscreen formulation. A further embodiment of the invention relates to a sunscreen composition having a sun protection factor greater than 30 including zinc oxide having an average particle size of 150 to 800 nm.Type: GrantFiled: November 15, 1999Date of Patent: July 31, 2001Assignee: Soltec Research PTY Ltd.Inventor: Neil Graham Halls
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Patent number: 6264903Abstract: An industrial waste stream recycling method for recovery of high purity zinc oxide products and other chemical and metal values from industrial waste streams containing zinc compounds by leaching the waste stream with a solution of 30% or greater by weight ammonium chloride, resulting in a first product solution and undissolved materials; adding zinc metal to the first product solution, whereby zinc-displaceable metal ions contained in the first product solution are displaced by the zinc metal and precipitate out of the first product solution as metals, leaving a second product solution; and diluting the second product solution with water, resulting in the precipitation of zinc oxide.Type: GrantFiled: June 22, 1999Date of Patent: July 24, 2001Inventors: Allan S. Myerson, Peter Robinson
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Patent number: 6254940Abstract: The present invention related to methods of manufacturing oxide, nitride, carbide, and boride powders and other ceramic, organic, metallic, carbon and alloy powders and films and their mixtures having well-controlled size and crystallinity characteristics. This invention relates, more particularly, to a development in the synthesis of the ceramic, metallic, composite, carbon and alloy nanometer-sized particles with precisely controlled specific surface area, or primary particle size, crystallinity and composition. The product made using the process of the present invention and the use of that product are also claimed herein.Type: GrantFiled: May 26, 1999Date of Patent: July 3, 2001Assignee: University of CincinnatiInventors: Sotiris E. Pratsinis, Srinivas Vemury