Aluminum Patents (Class 423/625)
  • Patent number: 6555496
    Abstract: A microcrystalline boehmite containing additive in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group consisting of alkaline earth metals, alkaline metals, rare earth metals, transition metals, actinides, silicon, gallium, boron, titanium, and phosphorus. The microcrystalline boehmite according to the invention may be prepared in several ways. In general, a microcrystalline boehmite precursor and an additive are converted to a microcrystalline boehmite containing the additive in a homogeneously dispersed state. The additive does not contain zirconia or magnesia.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: April 29, 2003
    Assignee: Akzo Nobel N.V.
    Inventors: Dennis Stamires, Paul O'Connor, Gregory Pearson, William Jones
  • Publication number: 20030077220
    Abstract: A method for making &ggr;-alumina includes drying wet alumina gels at temperatures and pressure below those commonly present in preparation of &ggr;-alumina. The method allows for production of &ggr;-alumina with greater ease of production and controllability of physical properties than known methods. Alumina produced using this method has high surface area and porosity and is highly suitable for making &ggr;-alumina powders for use as catalyst supports.
    Type: Application
    Filed: August 24, 2001
    Publication date: April 24, 2003
    Inventors: De-Yin Jeng, Tatsuo Sunayama, Takayuki Suzuki, Chorng-Jeou Chen
  • Publication number: 20030077221
    Abstract: Collections of particles are described that include crystalline aluminum oxide selected from the group consisting of delta-Al2O3 and theta-Al2O3. The particles have an average diameter less than about 100 nm. The particles generally have correspondingly large BET surface areas. In certain embodiments, the particle collections are very uniform. In some embodiments, collections of particles include doped aluminum oxides particles with an average diameter less than about 500 nm. The collections of particles can be deposited as coatings. Methods are described for producing desired aluminum oxide particles.
    Type: Application
    Filed: October 1, 2001
    Publication date: April 24, 2003
    Inventors: Shivkumar Chiruvolu, Yu K. Fortunak
  • Patent number: 6551572
    Abstract: A modified alumina is useful as metals passivator in fluidizable catalytic cracking catalysts. The modified alumina is prepared from a hydrated alumina, e.g., gibbsite, which is reacted with a low-molecular weight organic acid, e.g., acetic acid, forming aluminum salts. Calcination of the modified alumina results in decomposition of the aluminum salt.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: April 22, 2003
    Assignee: Akzo Nobel N.V.
    Inventor: Jose Carlos Duarte Macedo
  • Patent number: 6548037
    Abstract: Aluminum polychlorosulphates having the general formula (I) Al(OH)l Clm(SO4)nMp(I) where M represents an alkali metal l, m, n, p represent the number of moles per mole of aluminum, so that 1.74≦l≦2.25, 0.01≦n≦0.17, 0.32≦p≦1.49, and l+m+2n=p+3, their use as coagulation and flocculation agents, and their preparation process by reaction, at room temperature, of an alkali metal basic compound, such as Na2CO3, NaHCO3, NaOH, K2CO3, KHCO3 and KOH, and an alkali metal sulphate or sulphuric acid with an aluminum polychloride or polychlorosulphate having the general formula(I′) Al(OH)l′Clm′(SO4)n′Mp′(I′) where 1.1≦1′≦1.44, n′≦0.10, p′<p(p of formula (I)), and l′+m′+2n′=p′+3.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: April 15, 2003
    Inventor: Bernardo Pozzoli
  • Publication number: 20030064019
    Abstract: A process for producing alumina from bauxite is described in which bauxite is treated with an alkali to form a mixture comprising a solution of aluminum-containing ions and alumina trihydrate is precipitated from the solution. The process comprises treatment of the solution before or after the precipitation step with a layered double hydroxide in order to remove impurities from the solution by intercalation into the layers in the double hydroxide. The double hydroxide may contain layers of the formula: [LiAl2(OH)6]+.
    Type: Application
    Filed: October 4, 2002
    Publication date: April 3, 2003
    Applicant: Curtain University of Technology
    Inventors: Dermot Michael O'Hare, Andrew Michael Fogg, Gordon Michael Parkinson
  • Publication number: 20030064020
    Abstract: Alumina particles obtained from aluminum chloride by a gas phase method, the particles being amorphous or transition alumina particles and having an amorphous, &ggr;-, &dgr;- or &thgr;-crystalline form or a mixed form thereof, with primary particles thereof having an average particle diameter of 5 to 100 nm, and secondary particles, resulting from the aggregation of primary particles, having an average particle diameter of 50 to 800 nm.
    Type: Application
    Filed: June 26, 2002
    Publication date: April 3, 2003
    Applicant: SHOWA DENKO K.K.
    Inventors: Hisao Kogoi, Jun Tanaka, Hayato Yamaya
  • Publication number: 20030052047
    Abstract: Mesoporous crystalline alumina compositions and process for the preparation thereof are described. The compositions are useful as catalysts and absorbents.
    Type: Application
    Filed: July 27, 2001
    Publication date: March 20, 2003
    Applicant: Board of Trustees operating Michigan State University
    Inventors: Thomas J. Pinnavaia, Zhaorong Zhang, Randall Hicks
  • Publication number: 20030049198
    Abstract: Aluminium hydroxide of improved thermal stability is produced by spray-drying of an aqueous slurry of aluminium hydroxide at 400 to 600° C drying gas temperature. The resulting aluminium hydroxide is suitable as a flame retardant filler in polymeric systems with high processing temperatures. It has a low specific surface area and good rheological properties.
    Type: Application
    Filed: September 19, 2002
    Publication date: March 13, 2003
    Inventors: Neil Brown, Norbert Putz
  • Patent number: 6524549
    Abstract: Alpha alumina powder having a regulated particle size, a uniform particle shape and a narrow particle size distribution and further a low halogen content is produced by calcining at least one starting material selected from transition alumina and alumina compounds in a halogen-containing atmosphere which comprises a hydrogen halide gas, a halogen gas or a mixture of a halogen gas and steam and contains at least 0.1% by volume of at least one halogen-containing gas selected from the group consisting of hydrogen halide gas and halogen gas, and removing halogen from a calcined material. The produced alpha-alumina powder is excellent in a packing property and homogeneously packed.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: February 25, 2003
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Masahide Mohri, Norio Matsuda, Shinichiro Tanaka, Yoshio Uchida, Yoshinari Sawabe, Hisashi Watanabe, Hiroshi Ogawa
  • Patent number: 6521203
    Abstract: A process for producing &agr;-alumina containing &agr;-alumina single crystal particles characterized in that at least one of a transition alumina and transition alumina precursor is calcined in an atmosphere containing at least 1% by volume of hydrogen chloride at a temperature of not less than 600° C., preferably from 600 to 1,400° C., and more preferably from 800 to 1,200° C. Aluminum hydroxide, alum, aluminum sulfate, etc. are used as the alumina raw material capable of being converted to transition alumina on heating. &agr;-Alumina comprising octahedral or higher polyhedral &agr;-alumina single crystal particles have a high alumina purity above a given level, are fine and homogeneous, have a narrow particle size distribution, are not agglomerated particles, and can be obtained from raw materials of various kinds, purities, shapes, sizes, and compositions.
    Type: Grant
    Filed: September 3, 1997
    Date of Patent: February 18, 2003
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Masahide Mohri, Yoshio Uchida, Yoshinari Sawabe, Hisashi Watanabe
  • Patent number: 6518219
    Abstract: A catalyst for hydrofining fraction oils, comprises an alumina carrier and at least one metal and/or thereof oxide of Group VIB and at least one metal and/or thereof oxide of Group VIII supported on said alumina carrier. The pore volume of said alumina carrier is not less than 0.35 ml/g, in which the pore volume of the pores having a diameter of 40-100 angstrom accounts for more than 80% of the total pore volume, the alumina carrier is prepared by a special process. The catalyst possesses relatively high hydrogenation activity.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: February 11, 2003
    Assignees: China Petrochemical Corporation, Research Institute of Petroleum Processing, Sinopec
    Inventors: Qinghe Yang, Bin Liu, Hong Nie, Xuefen Liu, Dadong Li, Yahua Shi, Fucheng Zhuang
  • Patent number: 6517802
    Abstract: 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: Grant
    Filed: September 15, 2000
    Date of Patent: February 11, 2003
    Assignees: The University of Connecticut, Rutgers, The State University of New Jersey
    Inventors: Tongsan D. Xiao, Peter R. Strutt, Bernard H. Kear, Huimin Chen, Donald M. Wang
  • Patent number: 6514477
    Abstract: Printed circuit board laminates which have improved thermal stability. The improved properties are attributed to the use of a novel aluminium hydroxide which is described by the molecular representation: Al2O3·nH2O where n>2.6 and <2.9.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: February 4, 2003
    Inventors: Neil Brown, Michael Aggleton
  • Publication number: 20030017945
    Abstract: Porous spheroidal alumina particulate solids that comprise an alumina filler in an amount of about 0.1% to about 25% by weight of Al2O3 and have a mechanical resistance to shocks measured by spheres impacting against a target at the speed of 20 m/s such that the fines fragmentation percentage, of a size of less than 50% of the average size of the initial spheres, is less than 5% by weight. Preparation of these spheres by coagulation in drops from an oil-in-water-type emulsion. Application of these spheres as a catalyst substrate or as an adsorbent.
    Type: Application
    Filed: April 22, 2002
    Publication date: January 23, 2003
    Applicant: Institut Francais du Petrole
    Inventors: Frederic Kolenda, Nathalie Brunard, Charlotte Couroyer, Mojtaba Ghadiri
  • Patent number: 6506358
    Abstract: The present invention pertains to an improved process for the preparation of quasi-crystalline boehmite. In this improved process a quasi-crystalline boehmite precursor is aged at a pH below 7, prefereably under hydrothermal conditions. It was found that when conducting the preparation processes for quasi-crystalline aluminas described in the prior art at a pH below 7 and under hydrothermal conditions instead of the high pH and thermal aging used in the prior art, QCBs with higher crystallinity are obtained. In the process according to the invention additives may be added to the quasi-crystalline boehmite precursor. This results in a high quality QCB with additives in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group of rare earth metals alkaline earth metals, transition metals, actinides, silicon, gallium, boron, and phosphorus.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: January 14, 2003
    Assignee: Akzo Nobel B.V.
    Inventors: Dennis Stamires, Paul O'Connor, Gregory Pearson, William Jones
  • Patent number: 6503475
    Abstract: A process for the production of ultrafine powders that includes subjecting a mixture of precursor metal compound and a non-reactant diluent phase to mechanical milling whereby the process of mechanical activation reduces the microstructure of the mixture to the form of nano-sized grains of the metal compound uniformly dispersed in the diluent phase. The process also includes heat treating the mixture of nano-sized grains of the metal compound uniformly dispersed in the diluent phase to convert the nano-sized grains of the metal compound into a metal oxide phase. The process further includes removing the diluent phase such that the nano-sized grains of the metal oxide phase are left behind in the form of an ultrafine powder.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: January 7, 2003
    Assignee: Advanced Nano Technologies Pty Ltd.
    Inventors: Paul Gerard McCormick, Takuya Tzuzuki
  • Patent number: 6503867
    Abstract: The present invention pertains to a quasi-crystalline boehmite containing additive in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group of alkaline earth metals, alkaline metals, transition metals, actinides, silicon, gallium, boron, titanium, and phosphorus. Said QCBs according to the invention may be prepared in several ways. In general, a quasi-crystalline boehmite precursor and an additive are converted to a quasi-crystalline boehmite containing the additive in a homogeneously dispersed state.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: January 7, 2003
    Assignee: Akzo Nobel N.V.
    Inventors: Dennis Stamires, Paul O'Connor, Gregory Pearson, William Jones
  • Publication number: 20020192138
    Abstract: A process for continuously preparing finely divided refractory oxides having a particle specific surface area of less than about 100 m2/g from an oxygen containing reactant gas and at least one reactant selected from the group consisting of vaporous salts of silicon, titanium, aluminum, zirconium, iron and antimony, wherein at least one of the reactant materials is heated by means of a plasma generator which produces a temperature in the range of from about 3,000°-to about 12,000° C., and the reactants are combined and passed into a reaction zone for a period of from about 0.001 to about 1.0 second to give the oxide product. The oxygen-containing gas stream comprises from about 100 to about 105% of the stoichiometric amount of oxygen based on the vaporous salt and from about 10 to about 150%, based on oxygen, of a gaseous diluent which is inert under reaction conditions.
    Type: Application
    Filed: June 19, 2001
    Publication date: December 19, 2002
    Inventor: William A. Yuill
  • Patent number: 6495709
    Abstract: A precursor for forming an aluminum oxide film comprises a liquid solution of an aluminum organic precursor compound in an organic solvent. In a second embodiment, the precursor comprises a suspension of aluminum oxide powder in a solution of an aluminum organic precursor compound. A precursor according to the invention is deposited on a substrate by dipping, rolling, spraying, misted deposition, spin on deposition, or chemical vapor deposition then heated to fabricate transparent aluminum oxide films. The electronic properties of the aluminum oxide films may be improved by depositing a plurality of layers of the precursor and annealing the precursor between layers.
    Type: Grant
    Filed: March 16, 2000
    Date of Patent: December 17, 2002
    Assignees: Symetrix Corporation, Matsushita Electric Industrial Co., Ltd.
    Inventors: Jolanta Celinska, Jeffrey W. Bacon, Akihiro Matsuda, Carlos A. Paz de Araujo
  • Publication number: 20020164380
    Abstract: The present invention encompasses novel mesoporous compositions comprising vitamin E and alumina, and methods for their synthesis. The mesoporous compositions of the present invention have applications as drug-delivery vehicles.
    Type: Application
    Filed: February 19, 2002
    Publication date: November 7, 2002
    Inventors: Ying Ma, Kenneth J. Balkus
  • Patent number: 6468488
    Abstract: The present invention pertains to Mg—Al anionic clay having 3R2 stacking. This new polytype of anionic clay has a three-layer repeat, but it has a different interlayer arrangement than the conventional 3R1 hydrotalcite. Said new polytype can be applied in all applications described before for the conventional 3R1 polytype anionic clay such as in catalyst compositions, catalyst additive compositions, catalyst supports, absorbent compositions, stabilizer compositions and in medicaments.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: October 22, 2002
    Assignee: Akzo Nobel N.V.
    Inventors: Dennis Stamires, Paul O'Connor, William Jones
  • Patent number: 6461584
    Abstract: An admixture of hydrated alumina and an organic acid surfactant is calcined in an oxygen-depleted atmosphere, cooled before exposing it to air, comminuted and then centrifuged to produce nanometer-grade superfine &agr;-alumina powder.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: October 8, 2002
    Assignee: National Science Council
    Inventors: Shaw-Bing Wen, Chih-Peng Lin
  • Patent number: 6440187
    Abstract: Production of an alumina powder characterized by having a single or multiple crystal structure selected from the group consisting of &ggr;, &dgr; and &thgr;-forms, a primary particle size of 10 to 50 nm, a mean secondary particle size of 100 to 500 nm, and a granular primary particle shape, or an alumina powder characterized by having an a-form crystal structure, a primary particle size of 60 to 150 nm, a mean secondary particle size of 200 to 500 nm, and a granular primary particle shape, using as a raw material an alumina hydrate comprising rectangular plate-like primary particles having a boehmite structure and having a length of one side of 10 to 50 nm; and preparation of a polishing composition comprising the alumina powder, water and a polishing accelerator.
    Type: Grant
    Filed: July 18, 2000
    Date of Patent: August 27, 2002
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Toshio Kasai, Kiyomi Ema, Isao Ota, Tohru Nishimura
  • Patent number: 6440552
    Abstract: The present invention provide a boehmite in which (i) a crystallite diameter in the direction perpendicular to the plane (020) is about 65 angstrom or longer and (ii) a ratio of a crystallite diameter in the direction perpendicular to the plane (002) to a crystallite diameter in the direction perpendicular to the plane (200) is about 1.8 or more. By using the boehmite as a non-magnetic pigment, a base coat layer for magnetic recording medium having an excellent surface smoothness can be obtained.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: August 27, 2002
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kazuhisa Kajihara, Yoshiaki Takeuchi
  • Publication number: 20020107316
    Abstract: Described are hydrophobic particulate inorganic oxides useful for reinforcing polymeric composition, e.g., rubber. The materials are characterized by: (a) the substantial absence of functional groups capable of chemical reaction with rubber; (b) a BET surface area of in the range of from 40 to 350 m2/g; (c) a hydroxyl content in the range of 2 to 15 OH/nm2; (d) a carbon content in the range of from 0.1 to 6 percent by weight that is substantially non-extractable; (e) a pH in the range of from 3 to 10; (f) an M1 Standard White Area less than 0.4 percent and (g) a methanol wettability of from 15 to 45 percent. Compositions such as polymers, cured organic rubber articles, master batches and slurries containing the hydrophobic fillers are also described.
    Type: Application
    Filed: January 8, 2002
    Publication date: August 8, 2002
    Inventors: Jo-Ann E. Bice, Stuart D. Hellring, Timothy A. Okel
  • Patent number: 6429172
    Abstract: Pseudo-boehmite, which is a raw material for a catalyst carrier for hydrogenation refining, is produced by mixing, under a predetermined condition, an aluminate aqueous solution produced from an alkaline etching step for aluminum in an alumite treatment and an acidic aluminum aqueous solution produced from an anodization step for aluminum in the alumite treatment. Pseudo-boehmite can be also produced by maturing, with an alkaline solution, an aluminum hydroxide sludge produced from a washing step for aluminum in the alumite treatment. It is possible to establish a method for producing pseudo-boehmite, which makes it possible to reutilize a resource at extremely low cost by utilizing a treatment waste liquid and a sludge in an alumite treatment site.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: August 6, 2002
    Assignee: Japan Energy Corporation
    Inventors: Takayuki Tsukada, Yuji Ohashi, Hideo Segawa
  • Publication number: 20020102204
    Abstract: A cathode material for a lithium secondary battery having a high capacity, an excellent cycle property, and an excellent thermal stability. The cathode material for the lithium secondary battery is a layered compound having a general formula: LixNi1-a-b-c-dCOaM1bM2cM3dO2, wherein M1, M2, M3 are selected from Ti, Mg, B and Al and wherein the characters x, a, b, c and d respectively satisfy 1.0≦x≦1.2; 0.3≦a≦0.3; 0.005≦b≦0.1; 0.005≦c≦0.1; 0.005≦d≦0.1; and 0.115≦a+b+c+d≦0.
    Type: Application
    Filed: April 9, 2001
    Publication date: August 1, 2002
    Inventors: Kenji Kohiro, Ryuichi Nagase
  • Patent number: 6423133
    Abstract: The present invention relates to an aqueous suspension comprising: A) silica and/or alumina particles, and B) a compound of overall formula (I): Al(OH)a(SO4)b(SiOx)c(Y)d  (I)  with: a between 0.1 and 2, b between 0.3 and 1.5, c between 0 and 0.1, d greater than 0.05, Y chosen from alkali metals and alkaline earth metals, x between 2 and 4, and its derivatives, the said compound (B) being present in the suspension at a concentration of at least 1.65 mol/l, expressed as moles of aluminium issued from the said compound. Another subject-matter of the invention is a process useful for the preparation of the said suspension and its use in the field of cement pastes, mortars and concretes and in particular as setting and hardening accelerating agent for cements.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: July 23, 2002
    Assignee: Rhodia Chimie
    Inventors: Sylvie Touzet, Jean-Yves Chane-Ching, Evelyne Prat
  • Patent number: 6413308
    Abstract: A structured boehmite pigment which comprises a plurality of alumina monohydrate particles. The pigment is particularly useful as a flatting pigment in paint and as an anti-block agent in plastic film. The boehmite pigment has an aggregate median particle size of about 8 to about 30 microns; a total pore volume of at least about 0.8 ml/g; a differential pore volume of less than about 0.3 ml/g; an oil absorption of about 70 to about 135 m/g; a BET surface area of about 3 to about 20 m2/g, and a TAPPI brightness of at least about 90.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: July 2, 2002
    Assignee: J. M. Huber Corporation
    Inventors: Wen-Qing Xu, Gary M. Freeman
  • Patent number: 6406689
    Abstract: Compositions and methods are provided which can be utilized in active immunization as a prophylactic treatment or a therapeutic treatment for tumors. The compositions are employed as injectable tumor vaccines or as preparations for intratumoral administration and are capable of stimulating immune responses to specific tumor antigens. The tumor vaccines are composed of an antigenic cellular material including a plurality of inactivated tumor cells or tumor cell portions, a depot material, and an immunostimulant adsorbed to the depot material. The depot material with absorbed immunostimulant is mixed with the tumor cells or tumor cell portions to form the vaccine compositions. The preparations for intratumoral administration include the depot material adsorbed immunostimulant without the antigenic cellular material. The immunostimulant adsorbed to the depot material permits release of biologically active quantities of the immunostimulant over a period of time rather than all at once.
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: June 18, 2002
    Inventors: Frank W. Falkenberg, Oliver C. Krup
  • Patent number: 6403177
    Abstract: A method of removing ammonium ions or amines from contaminated water includes treating the water with sodium tetraphenylborate under acidic conditions. Advantageously, the tetraphenylborate is immobilized on polymer beads and the water is contacted with the beads or passed through a bed of the beads.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: June 11, 2002
    Assignee: Dalhousie University
    Inventors: T. Stanley Cameron, Osvald Knop, Neil S. Cameron, Elinor M. Cameron, G. Ronald Brown
  • Patent number: 6399528
    Abstract: The present invention relates to a porous aluminum oxide structure comprising Al2O3 and Zr, the structure having an open porosity greater than about 30% and an average pore size from about 20 nm to about 1000 nm, wherein the Zr, expressed as ZrO2, has a concentration less than about 5 weight % of the weight of the Al2O3.
    Type: Grant
    Filed: March 5, 2001
    Date of Patent: June 4, 2002
    Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung e.V.
    Inventors: Andreas Krell, Frank Buse, Hongwei Ma
  • Patent number: 6391273
    Abstract: The present invention relates to oxidic nanocrystals and a process and apparatus for producing oxidic nanocrystals from metalorganic compounds or volatile inorganic compounds. In particular, the process is suitable for oxidic or oxysulfidic nanocrystals, particularly based on the elements Y, Gd, Mg, Ca, Ba and Al. The nanocrystals preferably have a mean initial particle size of 1 to 20 nm.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: May 21, 2002
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventors: Armin Konrad, Torsten Fries, Alfred Gahn, Franz Kummer
  • Patent number: 6391277
    Abstract: An improvement in the Bayer process for producing alumina trihydrate in which bauxite ore is digested in a mixture with a digestion sodium aluminate liquor to produce a slurry, the slurry is settled to remove undigested residues therefrom and produce a pregnant liquor of sodium aluminate and alumina trihydrate is precipitated from the pregnant liquor in the presence of alumina trihydrate recycled as seed. When beginning the precipitation, an aliquot of the pregnant liquor with recycled alumina trihydrate is removed, subjected to mechanical action of an intensity and for a time sufficient to cause formation of seeds, and returned with the formed seeds to the beginning of the precipitation.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: May 21, 2002
    Assignee: Aluminium Pechiney
    Inventors: Bassam El Kadi, Philippe Clerin
  • Patent number: 6387341
    Abstract: This invention relates to a method of manufacturing a product based on a simple or mixed metal oxide, or silicon oxide, from a charge of one or more precursors comprising one or more organic precursors. These oxides can be, for example, oxides of Ti, Al, Mg, Th, Si, Ba, Bc or Zr etc. The method comprises bringing the charge of organo-metallic precursors into contact with a reaction medium that comprises supercritical C02, at a temperature of from 31 to 100° C. and a supercritical pressure of from 3×107 to 5×107 Pa, in order to form from the precursor, a product based on a simple or mixed metal oxide, or silicon oxide, from the reaction medium by reducing the pressure of the supercritical C02 to a pressure lower than the supercritical pressure.
    Type: Grant
    Filed: March 13, 2000
    Date of Patent: May 14, 2002
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Stéphane Sarrade, Luc Schrive, Christian Guizard, Anne Julbe
  • Publication number: 20020043734
    Abstract: This invention relates to a method of producing an alumina porous material using a mixed powder of alumina powder and aluminum hydroxide represented by the chemical formula Al(OH)3 at different percentages as the starting material, comprising the steps of heating this mixed powder to decompose the aluminum hydroxide and further heat treating it within a temperature range of 1,000 to 1,600° C., and to the alumina porous material produced by the above-mentioned method with a porosity exceeding 40 volume % and its specific surface area of 8 to 40 m2/g, and further to a filter and catalyst carrier that are obtained using this alumina porous material.
    Type: Application
    Filed: December 27, 2000
    Publication date: April 18, 2002
    Inventors: Tatsuki Ohji, Zhen-Yan Deng
  • Publication number: 20020039571
    Abstract: Compositions and methods are provided which can be utilized in active immunization as a prophylactic treatment or a therapeutic treatment for tumors. The compositions are employed as injectable tumor vaccines or as preparations for intratumoral administration and are capable of stimulating immune responses to specific tumor antigens. The tumor vaccines are composed of an antigenic cellular material including a plurality of inactivated tumor cells or tumor cell portions, a depot material, and an immunostimulant adsorbed to the depot material. The depot material with absorbed immunostimulant is mixed with the tumor cells or tumor cell portions to form the vaccine compositions. The preparations for intratumoral administration include the depot material adsorbed immunostimulant without the antigenic cellular material. The immunostimulant adsorbed to the depot material permits release of biologically active quantities of the immunostimulant over a period of time rather than all at once.
    Type: Application
    Filed: March 3, 1999
    Publication date: April 4, 2002
    Inventors: FRANK W. FALKENBERG, OLIVER C. KRUP
  • Patent number: 6364919
    Abstract: Disclosed is a process for preparing metal oxide slurries suitable for the chemical mechanical polishing (CMP) of semiconductor devices. A suspension of metal oxide in water is dispersed at a predetermined pressure through an orifice of a dispersion chamber while two intensifier pumps are used to maintain the pressure applied to the dispersion chamber constantly, resulting in restraining or minimizing the generation of macro particles as large as or larger than 1 &mgr;m. The metal oxide slurries are uniform in particle size with narrow particle size distribution and show excellent polishing performance with a significant reduction in the occurrence frequency of microscratches, so that they are suitable for CMP of ultra-integrated semiconductor devices.
    Type: Grant
    Filed: March 27, 2000
    Date of Patent: April 2, 2002
    Assignee: Cheil Industries, Inc.
    Inventors: Kil Sung Lee, Jae Seok Lee, Seok Jin Kim, Tu Won Chang
  • Publication number: 20020036157
    Abstract: A modified alumina is useful as metals passivator in fluidizable catalytic cracking catalysts. The modified alumina is prepared from a hydrated alumina, e.g., gibbsite, which is reacted with a low-molecular weight organic acid, e.g., acetic acid, forming aluminum salts. Calcination of the modified alumina results in decomposition of the aluminum salt.
    Type: Application
    Filed: September 20, 2001
    Publication date: March 28, 2002
    Inventor: Jose Carlos Duarte Macedo
  • Publication number: 20020027304
    Abstract: A method for the agglomeration of alumina particles, the method comprising the steps of: adding a quantity of pseudo-boehmite to the alumina particles; and spray drying the mixture so formed to produce agglomerated granules.
    Type: Application
    Filed: June 29, 2001
    Publication date: March 7, 2002
    Inventors: Barry J. Robson, Ronald Gallagher
  • Publication number: 20020012629
    Abstract: Disclosed herein is a recording medium comprising an alumina hydrate having an average pore radius of 20 to 200 Å and a half breadth of pore radius distribution of 20 to 150 Å.
    Type: Application
    Filed: January 13, 1998
    Publication date: January 31, 2002
    Inventors: HITOSHI YOSHINO, KYO MIURA, YUJI KONDO
  • Publication number: 20020004452
    Abstract: Disclosed is a hydrogen generation process for use with fuel cells which includes a preferential oxidation step to reduce the concentration of carbon monoxide. The preferential oxidation step includes contacting a fuel stream comprising hydrogen and carbon monoxide in the presence of an oxygen at a preferential oxidation temperature of between about 70° and about 160° C. with preferential oxidation catalyst for reducing the concentration of carbon monoxide to produce a treated fuel gas stream comprising less than about 50 ppm-vol carbon monoxide. The preferential oxidation catalyst comprises ruthenium metal disposed on an alumina carrier having a low density and a high porosity. Superior performance at low preferential oxidation temperatures below 130° C. was observed when the alumina carrier contained a bimodal pore distribution with an average pore distribution of from about 20 to about 3000 angstroms.
    Type: Application
    Filed: June 8, 2001
    Publication date: January 10, 2002
    Inventors: Suheil F. Abdo, Cynthia A. DeBoy, Geralyn F. Schroeder
  • Publication number: 20010055558
    Abstract: Alumina particles obtained from aluminum chloride by a gas phase method, the particles being amorphous or transition alumina particles and having an amorphous, &ggr;-, &dgr;- or &thgr;-crystalline form or a mixed form thereof, with primary particles thereof having an average particle diameter of 5 to 100 nm, and secondary particles, resulting from the aggregation of primary particles, having an average particle diameter of 50 to 800 nm.
    Type: Application
    Filed: June 27, 2001
    Publication date: December 27, 2001
    Applicant: SHOWA DENKO K.K.
    Inventors: Hisao Kogoi, Jun Tanaka, Hayato Yamaya
  • Patent number: 6328944
    Abstract: Doped, pyrogenically prepared oxides of metals and/or non-metals which are doped with one or more doping components in an amount of 0.00001 to 20 wt. %. The doping component may be a metal and/or non-metal or an oxide and/or a salt of a metal and/or a non-metal. The BET surface area of the doped oxide may be between 5 and 600 m2/g. The doped pyrogenically prepared oxides of metals and/or non-metals are prepared by adding an aerosol which contains an aqueous solution of a metal and/or non-metal to the gas mixture during the flame hydrolysis of vaporizable compounds of metals and/or non-metals.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: December 11, 2001
    Assignee: Degussa AG
    Inventors: Helmut Mangold, Rainer Golchert, Stipan Katusic, Karlheinz Janzon
  • Patent number: 6312619
    Abstract: A method of enhancing the dispersibility of alpha-alumina monohydrate wherein there is formed a mixture of an alpha-alumnina monohydrate, water, and a dispersibility enhancer comprising an effective amount of a monobasic acid, a salt selected from the group consisting of salts having the formula MX wherein M is a polyvalent metal cation constituent for which the solubility product KSP of the corresponding metal hydroxide is less than 10−20 and wherein X is an anion constituent derived from a monovalent acid having an ionization constant KA greater than 10+1 and certain phosphorus and antimony chlorides, followed by drying the mixture, without aging, to produce a dried, alpha-alumina monohydrate having advanced water dispersibility.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: November 6, 2001
    Assignee: Condea Vista Company
    Inventors: Dave S. Pope, Jimmy D. Brown
  • Publication number: 20010036438
    Abstract: An inorganic oxide powder is produced by a method which comprises a step of (i) introducing, into a dry-way pulverizer, an inorganic oxide in an amount of 100 parts by volume and air, nitrogen or a gas mixture thereof in an amount of from about 25,000 to about 160,000 parts by volume to pulverize the inorganic oxide by the dry-way pulverizer, or (ii) introducing, into a medium-stirring-type pulverizer, an inorganic oxide with a BET specific surface area of from about 1 to about 70 m2/g to pulverize the inorganic oxide by the medium-stirring-type pulverizer in a dry way at a specific energy consumption of from about 0.3 to about 1 kWh/kg. The inorganic oxide powder is capable of providing a ceramic with high density and high mechanical strength.
    Type: Application
    Filed: April 25, 2001
    Publication date: November 1, 2001
    Inventors: Koji Yamamoto, Yoshiaki Takeuchi
  • Publication number: 20010036437
    Abstract: Nanoscale, pyrogenically produced oxides and/or mixed oxides having a BET surface area of between 1 and 600 m2/g and a chloride content of less than 0.05 wt. % are produced by converting organometallic and/or organometalloid substances into the oxides at temperatures of above 200° C.
    Type: Application
    Filed: March 30, 2001
    Publication date: November 1, 2001
    Inventors: Andreas Gutsch, Thomas Hennig, Stipan Katusic, Michael Kramer, Gunther Michael, Geoffrey J. Varga
  • Patent number: 6309615
    Abstract: A process for the removal of reactive silica from a feedstock to the digestion step of the Bayer process for the manufacture of alumina, in which (a) the feedstock is contacted with a caustic liquor under process conditions which result in dissolving and stabilizing at least 50% of the silica into solution at a level of at least 3 gpL and without significant precipitation from solution of dissolved silica, (b) the silica bearing liquor is separated from solid residue of step (a) under conditions which do not promote significant precipitation of the silica; and (c) aluminosilicates are precipitated from the separated silica bearing liquor from step (b), to form a solid aluminosilicate product which is free of a majority of all other components of the feedstock.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: October 30, 2001
    Assignee: Comalco Aluminum Limited
    Inventors: Michael John Hollitt, Anthony John Crisp, Warren Scott Staker, Gerard Marcus Roe, Darren Paul Rodda
  • Patent number: 6306494
    Abstract: Novel, fine particulate synthetic chalcoalumite, process for preparation thereof, and a heat insulating agent and agricultural film containing said fine, particulate synthetic chalcoalumite. The above objects are met by synthetic chalcoalumite represented by formula (1) below: (M12+)a−x(M22+)Al3+4(OH)b(An−)c. mH2O  (1)  (in which M12+ stands for Zn2+ or Cu2+,  M22+ is at least one divalent metal ion selected from Ni2+, Co2+, Cu2+, Zn2+ and Mg2+,  a is 0.3<a<2.0 (with the proviso that M1 and M2 are not the same),  x is 0 ≦x<1.0, and x<a  b is 10<b<14,  An− is at least one selected from SO42−, HPO42−, CO32−, SO32−, HPO32−, NO3−, H2PO4−, Cl−, OH− and silicate ion,  c is 0.4<c<2.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: October 23, 2001
    Assignee: Kyowa Chemical Industry Co Ltd
    Inventors: Hideo Takahashi, Akira Okada