Iron, Cobalt, Or Nickel Compound Patents (Class 252/521.2)
  • Patent number: 6835459
    Abstract: 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: Grant
    Filed: November 6, 2002
    Date of Patent: December 28, 2004
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Wolfgang Lorenz, Andreas Kunz, Eva Wilke
  • Patent number: 6821679
    Abstract: 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: Grant
    Filed: January 17, 2003
    Date of Patent: November 23, 2004
    Assignee: Korea Institute of Science and Technology
    Inventors: Young-Soo Yoon, Won-Kook Choi, Ho-Young Park
  • Patent number: 6811726
    Abstract: 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: Grant
    Filed: May 12, 2003
    Date of Patent: November 2, 2004
    Inventor: Moises G. Sanchez
  • Patent number: 6806218
    Abstract: 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: Grant
    Filed: April 26, 2002
    Date of Patent: October 19, 2004
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Hiroshi Itahara, Shin Tajima, Toshihiko Tani, Kunihito Koumoto
  • Patent number: 6776928
    Abstract: 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: Grant
    Filed: January 29, 2002
    Date of Patent: August 17, 2004
    Assignee: Akzo Nobel N.V.
    Inventors: Tullio Rossini, Franco Folcio, Corrado Dotti
  • Patent number: 6773635
    Abstract: 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: Grant
    Filed: February 26, 2001
    Date of Patent: August 10, 2004
    Assignee: Corning Incorporated
    Inventors: Nicholas F. Borrelli, Lauren K. Cornelius, Dennis W. Smith, Paul A. Tick
  • Patent number: 6764617
    Abstract: 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: Grant
    Filed: November 16, 2001
    Date of Patent: July 20, 2004
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics & Space Administration
    Inventors: Tito Viswanathan, Brian Berry
  • Patent number: 6761839
    Abstract: 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: Grant
    Filed: August 27, 2001
    Date of Patent: July 13, 2004
    Inventors: Xiaohui Wang, Longtu Li, Ji Zhou, Zhengxing Yue, Zhenwei Ma, Shuiyuan Su
  • Patent number: 6758991
    Abstract: 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: Grant
    Filed: November 8, 2002
    Date of Patent: July 6, 2004
    Assignee: Alcoa Inc.
    Inventors: Robert A. DiMilia, Joseph M. Dynys, Douglas A. Weirauch, Jr., Siba P. Ray, Xinghua Liu, Frankie E. Phelps
  • Patent number: 6756154
    Abstract: 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: Grant
    Filed: November 28, 2001
    Date of Patent: June 29, 2004
    Assignee: Toda Kogyo Corporation
    Inventors: Hideaki Maeda, Shoichi Fujino, Mitsuaki Hatatani, Hiroyasu Watanabe, Norimiki Sugiyama, Hideaki Sadamura
  • Patent number: 6720111
    Abstract: 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: Grant
    Filed: December 19, 2000
    Date of Patent: April 13, 2004
    Assignee: Secretary, Agency of Industrial Science and Technology
    Inventors: Mitsuharu Tabuchi, Kazuaki Ado, Hironori Kobayashi, Hikari Sakaebe, Hiroyuki Kageyama
  • Patent number: 6716372
    Abstract: 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: Grant
    Filed: October 19, 2001
    Date of Patent: April 6, 2004
    Assignee: Valence Technology, Inc.
    Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey Swoyer
  • Patent number: 6660189
    Abstract: 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: Grant
    Filed: November 21, 2001
    Date of Patent: December 9, 2003
    Assignee: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Patent number: 6627120
    Abstract: 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: Grant
    Filed: January 30, 2003
    Date of Patent: September 30, 2003
    Assignee: Murata Manufacturing Co. Ltd.
    Inventor: Motohiro Shimizu
  • Patent number: 6627118
    Abstract: 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: Grant
    Filed: April 23, 2001
    Date of Patent: September 30, 2003
    Assignee: Hitachi Metals, Ltd.
    Inventors: Kagehiro Kageyama, Koji Sato
  • Publication number: 20030160219
    Abstract: 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: Application
    Filed: January 30, 2003
    Publication date: August 28, 2003
    Inventor: Motohiro Shimizu
  • Patent number: 6579475
    Abstract: 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: Grant
    Filed: December 7, 2000
    Date of Patent: June 17, 2003
    Assignee: FMC Corporation
    Inventors: Yuan Gao, Marina Yakovleva, John L. Burba, III, John F. Engel
  • Patent number: 6558582
    Abstract: 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: Grant
    Filed: November 6, 2000
    Date of Patent: May 6, 2003
    Assignee: Kyocera Corporation
    Inventors: Tetsuji Hayasaki, Masahiro Okumura
  • Patent number: 6555025
    Abstract: 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: Grant
    Filed: January 31, 2000
    Date of Patent: April 29, 2003
    Assignee: Candescent Technologies Corporation
    Inventors: Dmitriy Krupetsky, Anthony P. Schmid, Paul N. Ludwig
  • Patent number: 6551729
    Abstract: 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: Grant
    Filed: August 21, 2001
    Date of Patent: April 22, 2003
    Assignee: Murata Manufacturing Co. Ltd
    Inventors: Shinichi Taira, Atsuyoshi Maeda
  • Patent number: 6547372
    Abstract: 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: Grant
    Filed: July 19, 2002
    Date of Patent: April 15, 2003
    Assignee: Kyocera Corporation
    Inventor: Toshiaki Michihiro
  • Patent number: 6544444
    Abstract: 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: Grant
    Filed: December 19, 2000
    Date of Patent: April 8, 2003
    Assignee: Agency of Industrial Science and Technology
    Inventors: Ryoji Funahashi, Ichiro Matsubara, Satoshi Sodeoka
  • Patent number: 6537700
    Abstract: 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: Grant
    Filed: November 7, 2000
    Date of Patent: March 25, 2003
    Assignee: Ovonic Battery Company, Inc.
    Inventors: Stanford R. Ovshinsky, Boyko Aladjov, Srinivasan Venkatesan, Subhash K. Dhar
  • Patent number: 6508959
    Abstract: 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: Grant
    Filed: May 29, 2001
    Date of Patent: January 21, 2003
    Assignee: The Regents of the University of California
    Inventors: Lin Song Li, Quanxi Jia
  • Patent number: 6472972
    Abstract: 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: Grant
    Filed: May 15, 2000
    Date of Patent: October 29, 2002
    Assignee: NGK Insulators, Ltd.
    Inventor: Yoshihiko Ishida
  • Patent number: 6471890
    Abstract: 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: Grant
    Filed: April 9, 2001
    Date of Patent: October 29, 2002
    Assignee: Matsushita Electrical Industrial Co., Ltd.
    Inventors: Futoshi Tanigawa, Yasushi Nakamura, Yoshitaka Dansui, Kohji Yuasa
  • Patent number: 6447699
    Abstract: 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: Grant
    Filed: October 27, 2000
    Date of Patent: September 10, 2002
    Assignee: Alcatel
    Inventors: Patrick Bernard, Claudette Audry
  • Publication number: 20020037369
    Abstract: 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: Application
    Filed: October 3, 2001
    Publication date: March 28, 2002
    Inventors: Karl-Anton Starz, Willi Peter
  • Patent number: 6355187
    Abstract: 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: Grant
    Filed: July 28, 1999
    Date of Patent: March 12, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tomoki Sanada, Haruhiko Kano, Fumiya Adachi
  • Patent number: 6329065
    Abstract: 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: Grant
    Filed: August 23, 1999
    Date of Patent: December 11, 2001
    Assignee: Kyocera Corporation
    Inventors: Masanobu Ishida, Shigeki Yamada, Yasuhiko Yoshihara, Masamitsu Onitani
  • Patent number: 6319429
    Abstract: 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: Grant
    Filed: April 6, 2000
    Date of Patent: November 20, 2001
    Assignee: DaimlerChrysler AG
    Inventors: Ralf Moos, Wolfgang Menesklou, Hans-Jürgen Schreiner, Karl Heinz Härdtl
  • Patent number: 6306315
    Abstract: 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: Grant
    Filed: February 25, 1999
    Date of Patent: October 23, 2001
    Assignees: Denso Corporation, Nippon Soken, Inc.
    Inventors: Itsuhei Ogata, Masanori Yamada, Eturo Yasuda, Kaoru Kuzuoka
  • Patent number: 6300862
    Abstract: 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: Grant
    Filed: February 3, 2000
    Date of Patent: October 9, 2001
    Assignee: NGK Insulators, Ltd.
    Inventor: Yoshihiko Ishida
  • Patent number: 6270693
    Abstract: 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: Grant
    Filed: September 12, 2000
    Date of Patent: August 7, 2001
    Assignee: Ube Industries, Ltd.
    Inventors: Kazuyuki Hamada, Hiroshi Oda
  • Patent number: 6222262
    Abstract: 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: Grant
    Filed: December 3, 1999
    Date of Patent: April 24, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Satoshi Ueno, Akinori Nakayama, Terunobu Ishikawa, Hideaki Niimi, Yoichi Kawase
  • Patent number: 6218046
    Abstract: 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: Grant
    Filed: September 2, 1998
    Date of Patent: April 17, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Futoshi Tanigawa, Masumi Katsumoto, Fumio Kato, Tatsuhiko Suzuki, Yoshitaka Dansui, Kohji Yuasa