Iron, Cobalt, Or Nickel Compound Patents (Class 252/521.2)
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Patent number: 6835459Abstract: A conductive and weldable anti-corrosion composition for coating metal surfaces which contains: (a) 5 to 40 wt. % of an organic binder containing: (aa) at least one epoxide resin (ab) at least one hardener selected from cyanoguanidine, benzoguanamine and plasticised urea resin (ac) at least one amine adduct selected from polyoxyalkylenetriamine and epoxide resin/amine adducts (b) 0 to 15 wt. % of an anti-corrosion pigment (c) 40 to 70 wt. % of a conductive pigment selected from powdered zinc, aluminum, graphite, molybdenum sulfide, carbon black and iron phosphide (d) 0 to 45 wt. % of a solvent; and a lacquered metal structural part which has a conductive organic layer.Type: GrantFiled: November 6, 2002Date of Patent: December 28, 2004Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Wolfgang Lorenz, Andreas Kunz, Eva Wilke
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Patent number: 6821679Abstract: LiCoO2 nano powder of a high-temperature polymorph having a small and uniform size of grains which is obtained by modifying a surface of a precursor by mixing inert soluble salt on a Li-Co acetate precursor, and by heating the surface-modified precursor is provided, and a battery manufactured by using the powder as the cathode material has very excellent charging/discharging characteristics.Type: GrantFiled: January 17, 2003Date of Patent: November 23, 2004Assignee: Korea Institute of Science and TechnologyInventors: Young-Soo Yoon, Won-Kook Choi, Ho-Young Park
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Patent number: 6811726Abstract: This application describes ceramic oxide superconductors, their precursors and methods of preparation. The superconductors contain no copper, but comprise the transition metals Nickel or Cobalt (MT) together with bulky cations of Groups 2 and 1 of the Periodic Table (M2+ and M1+) such as Ba2+ and K1+. Their hexagonal crystal structure comprises parallel chains of highly covalent, octahedrally coordinated oxygen around the transition metal, which exhibits its highest valence +4. The octahedra are facet-linked forming polyacid chains or macroanions that run the full length of crystallites or single crystals along the c axis. The chains are separated by distances that prevent covalency or orbital overlap among them. They are held together by coulombic forces from the cations located between them that also run parallel to the c axis. Electrical current, carried by holes, can only flow within the chains.Type: GrantFiled: May 12, 2003Date of Patent: November 2, 2004Inventor: Moises G. Sanchez
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Patent number: 6806218Abstract: Grain oriented ceramics constituted of a polycrystalline body of a layered cobaltite in which a {001} plane of each grain constituting the polycrystalline body has an average orientation degree of 50% or more by the Lotgering's method. In this case, the layered cobaltite is preferably a layered calcium cobaltite expressed by the following general formula: {(Ca1−xAx)2CoO3+&agr;} (CoO2+&bgr;)y (where A represents one or more elements selected among an alkali metal, an alkaline earth metal and Bi, 0≦×≦0.3, 0.5≦y≦2.0, and 0.85≦{3+&agr;+(2+&bgr;)y}/(3+2y)≦1.15). Such grain oriented ceramics are obtained by molding a mixture of the first powder constituted of a Co(OH)2 platelike powder and the second powder constituted of CaCO3 and the like such that a developed plane of the platelike powder is oriented, and by heating the green body at a predetermined temperature.Type: GrantFiled: April 26, 2002Date of Patent: October 19, 2004Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Hiroshi Itahara, Shin Tajima, Toshihiko Tani, Kunihito Koumoto
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Patent number: 6776928Abstract: The invention relates to an electrically conductive powder coating composition having anti-static properties comprising metallic fibers. Further, the coating composition shows effective EMF shielding. Very good results are found when the metallic fibers have an L/D ratio in the range between 5 and 75, wherein L is the length of the fiber and D is the diameter of the fiber. In a preferred embodiment stainless steel fibers are incorporated in the powder coating composition.Type: GrantFiled: January 29, 2002Date of Patent: August 17, 2004Assignee: Akzo Nobel N.V.Inventors: Tullio Rossini, Franco Folcio, Corrado Dotti
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Patent number: 6773635Abstract: Materials, both glass and glass-ceramic, that exhibit UV-induced changes in light transmission and electrical conductivity behavior. The materials consist essentially, in mole %, of 20-40% SiO2, 10-20% AlO1.5, 35-55% SiO2+AlO1.5, at least 30% CdF2, 0-20% PbF2, and/or ZnF2, 0-15% rare earth metal fluoride, and 45-65% total metal fluorides.Type: GrantFiled: February 26, 2001Date of Patent: August 10, 2004Assignee: Corning IncorporatedInventors: Nicholas F. Borrelli, Lauren K. Cornelius, Dennis W. Smith, Paul A. Tick
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Patent number: 6764617Abstract: A conductive ferromagnetic composition of matter comprising sulfonated lignin or a sulfonated polyflavonoid, or derivatives thereof, and ferromagnetic iron oxide particles is disclosed. Among the uses of the composition is to shield electromagnetic radiation. The ferromagnetic iron oxide particles of the composition are surprisingly stable to acid, and are easily and inexpensively formed from iron cations in solution.Type: GrantFiled: November 16, 2001Date of Patent: July 20, 2004Assignee: The United States of America as represented by the Administrator of the National Aeronautics & Space AdministrationInventors: Tito Viswanathan, Brian Berry
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Patent number: 6761839Abstract: A composition of material used for making hfMLCIs having a sintering temperature below 1000°. The composition comprises a major component and a minor component, said major component being a general formula: Ba3Co2-x-yZnxCuyMnxFe24-z-wO41, wherein x, z, w,=0-1.0 and y=0-0.8, and said minor component comprising at least one compound selected from the group of Bi2O3, V2O5,PbO,B2O3, Lif and CaF2. HfMLCIs made from the composition of the present invention are capable of functioning in the frequency region of 300-800 MHz.Type: GrantFiled: August 27, 2001Date of Patent: July 13, 2004Inventors: Xiaohui Wang, Longtu Li, Ji Zhou, Zhengxing Yue, Zhenwei Ma, Shuiyuan Su
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Patent number: 6758991Abstract: Ceramic inert anodes useful for the electrolytic production of aluminum are disclosed. The inert anodes comprise an oxide of Ni and Fe having a controlled Ni/(Ni+Fe) mole ratio which results in a single-phase structure at the operation temperatures of aluminum production cells. The Ni and Fe oxide material may also have a single-phase structure at the sintering temperature of the material. The single-phase inert anode materials maintain sufficient electrical conductivity at the operating temperatures of the cell, and also possess good mechanical stability.Type: GrantFiled: November 8, 2002Date of Patent: July 6, 2004Assignee: Alcoa Inc.Inventors: Robert A. DiMilia, Joseph M. Dynys, Douglas A. Weirauch, Jr., Siba P. Ray, Xinghua Liu, Frankie E. Phelps
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Patent number: 6756154Abstract: A cathode active material for a non-aqueous electrolyte secondary cell having a c-axis length of lattice constant of 14.080 to 14.160 Å, an average particle size of 0.1 to 5.0 &mgr;m, and a composition represented by the formula: LiCo(1−x−y)MnxMgyO2 wherein x is a number of 0.008 to 0.18; and y is a number of 0 to 0.18. This cathode active material is capable of maintaining an initial discharge capacity required for secondary cells and showing improved charge/discharge cycle characteristics under high temperature conditions.Type: GrantFiled: November 28, 2001Date of Patent: June 29, 2004Assignee: Toda Kogyo CorporationInventors: Hideaki Maeda, Shoichi Fujino, Mitsuaki Hatatani, Hiroyasu Watanabe, Norimiki Sugiyama, Hideaki Sadamura
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Patent number: 6720111Abstract: The present invention provides a single-phase lithium ferrite based oxide which is suitable as a cathode material for a secondary battery, a process for preparing the oxide, and its uses, the oxide having a layered rock salt-type structure and comprising lithium ferrite (LiFeO2)−Li2-xMO3-y solid solution wherein M is at least one species selected from the group consisting of Mn, Ti and Sn, 0≦x<2, 0≦y≦1 such that the proportion of iron is 0.1≦Fe/(Fe+M)≦0.9.Type: GrantFiled: December 19, 2000Date of Patent: April 13, 2004Assignee: Secretary, Agency of Industrial Science and TechnologyInventors: Mitsuharu Tabuchi, Kazuaki Ado, Hironori Kobayashi, Hikari Sakaebe, Hiroyuki Kageyama
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Patent number: 6716372Abstract: The invention provides novel lithium-mixed metal materials which, upon electrochemical interaction, release lithium ions, and are capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel lithium-mixed metal materials. Methods for making the novel lithium-mixed metal materials and methods for using such lithium-mixed metal materials in electrochemical cells are also provided. The lithium-mixed metal materials comprise lithium and at least one other metal besides lithium. Preferred materials are lithium-mixed metal phosphates which contain lithium and two other metals besides lithium.Type: GrantFiled: October 19, 2001Date of Patent: April 6, 2004Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey Swoyer
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Patent number: 6660189Abstract: The present invention provides a production process of a Mn—Zn ferrite that enables wastes of sintered cores to be recycled without serious difficulties in sintering. The production process comprises recycling a powder obtained by milling a sintered Mn—Zn ferrite, thereby obtaining a sintered core having a component composition including 44.0 to 49.8 mol % Fe2O3, 4.0 to 26.5 mol % ZnO, 1.0 to 3.0 mol % CoO, 0.02 to 1.00 mol % Mn2O3 and a remainder MnO.Type: GrantFiled: November 21, 2001Date of Patent: December 9, 2003Assignee: Minebea Co., Ltd.Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
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Patent number: 6627120Abstract: In order to achieve miniaturization and an increase in the capacitance of a monolithic ceramic capacitor, a conductive paste suitable for forming an internal conductor film is provided, the layer thickness of the internal conductor film being decreased with a decrease in the layer thickness of a dielectric ceramic layer. The conductive paste contains a conductive powder, such as a nickel powder, an organic vehicle, an organic acid barium salt and an organic zirconium compound. Each of the organic acid barium salt in terms of barium atom and the organic zirconium compound in terms of zirconium atom is about 0.05 to 1.00 mol per mol of the conductive powder, and the content of the organic zirconium compound in terms of zirconium atom is about 0.98 to 1.02 mol per mol of the organic acid barium salt in terms of barium atom.Type: GrantFiled: January 30, 2003Date of Patent: September 30, 2003Assignee: Murata Manufacturing Co. Ltd.Inventor: Motohiro Shimizu
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Patent number: 6627118Abstract: A crystalline Ni alloy particle for an anisotropic conductive film comprising Ni and a metalloid element such as P, B, etc. and having a structure in which a Ni intermetallic compound phase is precipitated can be produced by preparing substantially amorphous Ni alloy particle by an electroless reduction method, and heat-treating the substantially amorphous Ni alloy particle. The Ni alloy particle is preferably heat-treated after disintegration, and preferably coated with Au.Type: GrantFiled: April 23, 2001Date of Patent: September 30, 2003Assignee: Hitachi Metals, Ltd.Inventors: Kagehiro Kageyama, Koji Sato
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Publication number: 20030160219Abstract: In order to achieve miniaturization and an increase in the capacitance of a monolithic ceramic capacitor, a conductive paste suitable for forming an internal conductor film is provided, the layer thickness of the internal conductor film being decreased with a decrease in the layer thickness of a dielectric ceramic layer. The conductive paste contains a conductive powder, such as a nickel powder, an organic vehicle, an organic acid barium salt and an organic zirconium compound. Each of the organic acid barium salt in terms of barium atom and the organic zirconium compound in terms of zirconium atom is about 0.05 to 1.00 mol per mol of the conductive powder, and the content of the organic zirconium compound in terms of zirconium atom is about 0.98 to 1.02 mol per mol of the organic acid barium salt in terms of barium atom.Type: ApplicationFiled: January 30, 2003Publication date: August 28, 2003Inventor: Motohiro Shimizu
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Patent number: 6579475Abstract: The present invention includes lithium cobalt oxides having hexagonal layered crystal structures and methods of making same. The lithium cobalt oxides of the invention have the formula LiwCo1−xAxO2+y wherein 0.96≦w≦1.05, 0≦x≦0.05, −0.02≦y≦0.02 and A is one or more dopants. The lithium cobalt oxides of the invention preferably have a position within the principal component space defined by the relationship axi+byi≦c, wherein xi={right arrow over (S)}i&Circlesolid;{right arrow over (P)}c1; yi={right arrow over (S)}i&Circlesolid;{right arrow over (P)}c2; the vector {right arrow over (S)}i is the x-ray spectrum for the LiwCo1−xAxO2+y compound; the vectors {right arrow over (P)}c1 and {right arrow over (P)}c2 defining the principal component space are determined by measuring the x-ray powder diffraction values {right arrow over (S)}i between 15° and 120° using a 0.Type: GrantFiled: December 7, 2000Date of Patent: June 17, 2003Assignee: FMC CorporationInventors: Yuan Gao, Marina Yakovleva, John L. Burba, III, John F. Engel
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Patent number: 6558582Abstract: A semiconductive ceramic contains a compound of MgO and SiO2 as a main component, and an iron oxide such as FeO, Fe2O3, and Fe3O4 as an electric conductivity provider. According to necessity, the semiconductive ceramic further contains at least one of zinc oxide, niobium oxide, and chromium oxide as an electric conductivity provider. The semiconductive ceramic has a desired electric conductivity and a mechanical strength required for structural material, thus being usable in various applications.Type: GrantFiled: November 6, 2000Date of Patent: May 6, 2003Assignee: Kyocera CorporationInventors: Tetsuji Hayasaki, Masahiro Okumura
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Patent number: 6555025Abstract: A tuned sealing material and a method for attaching a first surface to a second surface using the tuned sealing material are disclosed. In one embodiment, the present invention applies a tuned sealing material between a first surface and a second surface. In this embodiment, the tuned sealing material is comprised of a combination of a filler material and a glass material. Furthermore, in this embodiment, the filler material is tuned to absorb electromagnetic radiation of a selected frequency. Next, in the present embodiment, the tuned sealing material is subjected to the electromagnetic radiation of the selected frequency. As a result of tuning the filler material, the tuned sealing material absorbs the electromagnetic radiation of the selected frequency. After absorbing the electromagnetic radiation of the desired frequency, the tuned sealing material is used to attach the first surface and the second surface.Type: GrantFiled: January 31, 2000Date of Patent: April 29, 2003Assignee: Candescent Technologies CorporationInventors: Dmitriy Krupetsky, Anthony P. Schmid, Paul N. Ludwig
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Patent number: 6551729Abstract: A conductive paste is provided which can prevent the generation of wrinkles on electrode films after drying and which can be used for forming a highly reliable ceramic electronic element having superior appearance. The conductive paste contains a conductive component such as silver or copper and an organic vehicle. The organic vehicle contains an organic binder, a first solvent dissolving the organic binder and a second solvent substantially not dissolving the organic binder, wherein the boiling point of the first solvent is higher than that of the second solvent or is higher than the temperature at the end of distillation thereof by about 20° C. or more, and the content of the second solvent is about 30 to 70 wt % of the organic vehicle.Type: GrantFiled: August 21, 2001Date of Patent: April 22, 2003Assignee: Murata Manufacturing Co. LtdInventors: Shinichi Taira, Atsuyoshi Maeda
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Patent number: 6547372Abstract: The present invention provides an ink jet head comprising a head substrate 1, a heat-generating resistor 3 and a pair of electrodes 4, which are attached on the head substrate 1, and a top plate 6 disposed above the head substrate 1, the ink jet head being capable of ejecting ink, with which the space between the head substrate 1 and the top plate 6 is filled, through an ink ejection opening by means of heat of the heat-generating resistor, wherein the heat-generating resistor is made of a silicon oxide material selected from the group consisting of (1) a material consisting of TaxSiOy (1.30≦x≦1.70 and 1.20≦y≦1.95), (2) a material consisting of NbxSiOy (1.4≦x≦1.9 and 1.4≦y≦1.9), (3) a TiC—SiO2 resistive material, a TiC content in the resistive material being set within a range from 55 to 90 mol %, and (4) a Ta—Ni—SiOx (1.2≦x≦2.Type: GrantFiled: July 19, 2002Date of Patent: April 15, 2003Assignee: Kyocera CorporationInventor: Toshiaki Michihiro
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Patent number: 6544444Abstract: This invention provides a complex oxide comprising the features of: (i) being represented by the formula: (A0.4B0.1M0.1)x/0.6Co2Oy wherein A and B are elements differing from each other, each represents Ca, Sr or Ba, M represents Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb or Lu, 1.7≦x≦2, and 3.8≦y≦5, (ii) having a Seebeck coefficient of 100 &mgr;V/K or more at a temperature of 100 K (absolute temperature) or higher and (iii) having an electrical resistivity of 10 m&OHgr;cm or less at a temperature of 100 K (absolute temperature) or higher. The complex oxide of the invention is a material composed of low-toxicity elements existing in large amounts, the material having superior heat resistance and chemical durability and a high thermoelectric conversion efficiency in a temperature range of 600 K or higher which falls in the temperature range of waste heat.Type: GrantFiled: December 19, 2000Date of Patent: April 8, 2003Assignee: Agency of Industrial Science and TechnologyInventors: Ryoji Funahashi, Ichiro Matsubara, Satoshi Sodeoka
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Patent number: 6537700Abstract: An active material mixture for use in a paste for fabricating positive electrodes, comprising a nickel hydroxide material, and an additive material comprising at least one material selected from the group consisting of a misch metal or a misch metal alloy. A nickel positive electrode and an alkaline electrochemical cell using this active material mixture.Type: GrantFiled: November 7, 2000Date of Patent: March 25, 2003Assignee: Ovonic Battery Company, Inc.Inventors: Stanford R. Ovshinsky, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar
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Patent number: 6508959Abstract: A process is provided for the preparation of a metallic oxide composite including mixing an aqueous solution of a water-soluble metal compound and colloidal silica, depositing the mixture upon a substrate, heating the mixture-coated substrates at temperatures from about 150° C. to about 300° C. for time sufficient to form a metallic oxide film, and, removing the silica from the metallic oxide film whereby a porous metal oxide structure is formed.Type: GrantFiled: May 29, 2001Date of Patent: January 21, 2003Assignee: The Regents of the University of CaliforniaInventors: Lin Song Li, Quanxi Jia
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Patent number: 6472972Abstract: A PTC composite material including a matrix of ceramic material having one of a cristobalite crystal structure and a tridymite crystal structure, each doped with an oxide of at least one of Be, B, Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge and W, and a conductive phase dispersed throughout the matrix. The conductive phase includes at least one of a metal, silicide, nitride, carbide and boride.Type: GrantFiled: May 15, 2000Date of Patent: October 29, 2002Assignee: NGK Insulators, Ltd.Inventor: Yoshihiko Ishida
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Patent number: 6471890Abstract: The method for producing a positive electrode active material for an alkaline storage battery is disclosed. The method includes a first oxidation treatment of a raw material powder comprising a nickel hydroxide solid solution and cobalt hydroxide to oxidize the cobalt hydroxide to a cobalt oxyhydroxide; and a second oxidation treatment of the powder obtained in the first oxidation treatment to oxidize the nickel hydroxide solid solution to a nickel oxyhydroxide solid solution.Type: GrantFiled: April 9, 2001Date of Patent: October 29, 2002Assignee: Matsushita Electrical Industrial Co., Ltd.Inventors: Futoshi Tanigawa, Yasushi Nakamura, Yoshitaka Dansui, Kohji Yuasa
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Patent number: 6447699Abstract: An electrode conductive material includes a non-stoichiometric oxidized cobalt compound whose electrical conductivity is greater than 5×10−3 S/cm and which has a direct spinel structure and formula Co2+xCo3+yO4, with 0.73≦≦0.80 and 1.87≦y≦1.95. An alkaline electrolyte secondary storage cell positive electrode includes a current collector and a layer containing a binder, particles of an electrochemically active material and the aforementioned conductive material, the proportion by weight of the conductive material in the layer being from 4% to 10% of the active material.Type: GrantFiled: October 27, 2000Date of Patent: September 10, 2002Assignee: AlcatelInventors: Patrick Bernard, Claudette Audry
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Publication number: 20020037369Abstract: A coating composition for producing electrically conductive coatings, containing one or more electrically conductive pigments and an organic binder, as well as, optionally, additives and auxiliary agents, in an aqueous solvent, which organic binder contains a copolymer dispersible in water and based on (meth)acrylate- and silylated, unsaturated monomers. The total content of organic solvents in the composition does not exceed 0.5% by weight. The coatings thus obtained are especially well-bonded and resistant to mechanical influences and to solvents, and exhibit suitable conductivity (sheet resistivity) values.Type: ApplicationFiled: October 3, 2001Publication date: March 28, 2002Inventors: Karl-Anton Starz, Willi Peter
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Patent number: 6355187Abstract: There is provided a conductive paste comprising a conductive component, a glass frit, and a vehicle, wherein the glass frit comprises a glass and at least one of alumina (Al2O3), silica (SiO2), titania (TiO2) and zirconia (ZrO2). The conductive paste is capable of being baked at a low temperature with sufficient coloring, and is suitable for forming a circuit on a glass substrate, the glass circuit substrate suitable for application in a defogging glass for an automobile window formed therewith.Type: GrantFiled: July 28, 1999Date of Patent: March 12, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Tomoki Sanada, Haruhiko Kano, Fumiya Adachi
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Patent number: 6329065Abstract: A wiring board having an insulating substrate of aluminum oxide ceramics and a surface wiring layer formed on the surface of said insulating substrate, wherein the aluminum oxide ceramics constituting said insulating substrate contains a manganese compound in an amount of from 2.0 to 10.0% by weight in terms of MnO2, and has a relative density of not smaller than 95%, and said surface wiring layer contains copper in an amount of from 10 to 70% by volume and at least one high-melting metal selected from the group consisting of tungsten and molybdenum in an amount of from 30 to 90% by volume, and further contains copper as a matrix, said copper matrix having a diffusion structure in which are diffused the particles of said high-melting metal having an average particle diameter of from 1 to 10 &mgr;m.Type: GrantFiled: August 23, 1999Date of Patent: December 11, 2001Assignee: Kyocera CorporationInventors: Masanobu Ishida, Shigeki Yamada, Yasuhiko Yoshihara, Masamitsu Onitani
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Patent number: 6319429Abstract: Oxygen sensitive resistance materials for use with oxygen sensors, in particular &lgr; probes are described. These materials are based on the fact that with complex metal oxides it is possible—by adding suitable doping substances—to achieve a negligible temperature dependence of the electric resistance of these materials for different oxygen partial pressures and to preset it to a desired partial pressure value.Type: GrantFiled: April 6, 2000Date of Patent: November 20, 2001Assignee: DaimlerChrysler AGInventors: Ralf Moos, Wolfgang Menesklou, Hans-Jürgen Schreiner, Karl Heinz Härdtl
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Patent number: 6306315Abstract: The thermistor portion of a thermistor device consists of a mixed sintered body of aY(Cr0.5Mn0.5)O3.bAl2O3 made of the perovskite-type compound Y(Cr0.5Mn0.5)O3 and Al2O3, or a mixed sintered body of aY(Cr0.5Mn0.5)O3.b(Al2O3+Y2O3) made of Y(Cr0.5Mn0.5)O3, Al2O3 and Y2O3. The mole fractions a and b have the relationships 0.05≦a>1.0, 0<b≦0.95 and a+b=1. This is required to obtain a thermistor device that has stable characteristics and exhibits a small change in its resistance value, even in a heat history from room temperature to 1000° C. or the like, and also has a resistance value of 50&OHgr; to 100 k&OHgr; in the temperature range from room temperature to 1000° C.Type: GrantFiled: February 25, 1999Date of Patent: October 23, 2001Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Itsuhei Ogata, Masanori Yamada, Eturo Yasuda, Kaoru Kuzuoka
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Patent number: 6300862Abstract: A PTC composite material including a matrix of ceramic material having one of a cristobalite crystal structure and a tridymite crystal structure, each doped with an oxide of at least one of Be, B, Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, and Ge, and a conductive phase dispersed throughout the matrix. The conductive phase includes at least one of a metal, silicide, nitride, carbide and boride.Type: GrantFiled: February 3, 2000Date of Patent: October 9, 2001Assignee: NGK Insulators, Ltd.Inventor: Yoshihiko Ishida
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Patent number: 6270693Abstract: A thermistor composition that is in use within a range of room temperature to 400° C. has the general formula Mn2−a−b−cZnaNibFec+dCo1−dO4, wherein 0.1≦a<1, 0≦b<1, 0<c<1, 0≦d<1 and 0.1<a+b<1. A preferred thermistor composition has a B constant (B25/85) within a range of 3,300-4,960 K, a resistivity (&rgr;25) within a range of 400-88,000 &OHgr;·cm and a resistance variation rate (&Dgr;R25) of 2% or less. The composition is suitable for a thermistor or a thermistor device using the same.Type: GrantFiled: September 12, 2000Date of Patent: August 7, 2001Assignee: Ube Industries, Ltd.Inventors: Kazuyuki Hamada, Hiroshi Oda
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Patent number: 6222262Abstract: A semiconductor ceramic device includes a semiconductor ceramic sintered body and external electrodes. The semiconductor ceramic sintered body contains a lanthanum cobalt type oxide major component, about 0.1 to 10 mol % on an element conversion basis of an oxide of Cr as a sub-component, and about 0.001 to 0.5 mol % on an element conversion basis of at least one of the oxides of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Ni, Cu and Zn.Type: GrantFiled: December 3, 1999Date of Patent: April 24, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Satoshi Ueno, Akinori Nakayama, Terunobu Ishikawa, Hideaki Niimi, Yoichi Kawase
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Patent number: 6218046Abstract: The present invention provides a positive electrode material for alkaline storage batteries which has high energy density and causes little capacity reduction even when a charge/discharge cycle is repeated at high temperatures. The positive electrode material for alkaline storage batteries of the present invention comprises nickel hydroxide particles and a layers of cobalt oxide coating the nickel hydroxide particles. A valence of cobalt of the cobalt oxide is greater than 3.0, and the cobalt oxide contains sodium ions or potassium ions inside the crystal and further fixes lithium hydroxide or lithium ions.Type: GrantFiled: September 2, 1998Date of Patent: April 17, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Futoshi Tanigawa, Masumi Katsumoto, Fumio Kato, Tatsuhiko Suzuki, Yoshitaka Dansui, Kohji Yuasa