Patents Examined by Ngoclan Mai
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Patent number: 6755885Abstract: A powder composition for warm compaction comprising an iron-based powder and a lubricant powder consisting essentially of an amide described by the following formula D—Cm—B—A—B—Cm—D wherein D is —H, COR, CNHR, wherein R is a straight or branched aliphatic or aromatic group including 2-21 C atoms; C is the group —NH (CH)n CO—; B is amino or carbonyl; A is alkylene having 4-16 C atoms optionally including up to 4 O atoms m is an integer 1-10 and n is an integer 5-11.Type: GrantFiled: July 25, 2002Date of Patent: June 29, 2004Assignee: Hëganäs ABInventors: Hilmar Vidarsson, Per Knutsson
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Patent number: 6755883Abstract: A powder pressing apparatus comprises a die having a through hole, an upper punch and a lower punch. At least one of the upper and lower punches has a punching surface having an edge portion provided with a projection. The projection has a tip chamfered by a width not greater than 0.5 mm. The punching surface has a slope having a surface roughness Ra not greater than 1.0 &mgr;m. A rare-earth alloy powder is fed into a cavity formed in the through hole of the die. The rare-earth alloy powder in the cavity is oriented by magnetic field, and pressed by using the upper and lower punches. The upper punch and the lower punch are brought closest to each other at a minimum distance not smaller than 1.7 mm during the pressing. An obtained compact is used for manufacture of a sintered body and a voice coil motor.Type: GrantFiled: August 22, 2002Date of Patent: June 29, 2004Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Seiichi Kohara, Shinji Kidowaki
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Patent number: 6755884Abstract: A niobium powder for capacitors, having an average particle size of from 10 to 500 &mgr;m, which is a granulated powder having an oxygen content of 3 to 9% by mass; a sintered body thereof; and a capacitor fabricated from the sintered body as one part electrode, a dielectric material formed on the surface of the sintered body, and another part electrode provided on the dielectric material. A capacitor manufactured from the sintered body of a niobium powder of the present invention is prevented from deterioration in the performance for a long period of time and has high reliability.Type: GrantFiled: July 26, 2002Date of Patent: June 29, 2004Assignee: Showa Denko K.K.Inventors: Kazumi Naito, Nobuyuki Nagato
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Patent number: 6737016Abstract: Disclosed is a process for manufacturing a sintered slide bearing. A sintered porous bearing body is prepared from a powdered metal material and a resin material in a fluidable state is penetrated into the sintered porous bearing body. The resin material in the sintered porous bearing body is hardened, and the sintered porous bearing body after the hardening of the resin material is repressed to reduce a gap produced between the sintered porous bearing body and the hardened resin material by volume reduction caused on the resin material at the hardening.Type: GrantFiled: May 8, 2002Date of Patent: May 18, 2004Assignee: Hitachi Powdered Metals Co, Ltd.Inventors: Hideo Shikata, Hidekazu Tokushima, Tadayoshi Yano
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Patent number: 6726740Abstract: A sintered, magnetically soft composite is proposed, especially for use in solenoid valves, and a process for producing such a composite, in which initially a starting mixture from which the magnetically soft composite is formed after sintering is produced, having a ferromagnetic, especially powdery first starting component (11) as main constituent, and a ferritic second starting component (12) as secondary constituent, as well as possibly a pressing aid. After the starting mixture is sintered, the second starting component (12) is present in the produced composite at least largely as grain boundary phase. The proposed manufacturing process includes the process steps: provision of the starting mixture; mixing of the starting mixture; compression of the starting mixture in a cavity mold under increased pressure; removal of the binder from the compressed starting mixture; and sintering of the compressed starting mixture to form the composite.Type: GrantFiled: November 13, 2001Date of Patent: April 27, 2004Assignee: Robert Bosch GmbHInventors: Waldemar Draxler, Thomas Christmann, Horst Boeder
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Patent number: 6726741Abstract: Aluminum powder, neutron absorber, and third particle composed of oxide, nitride, carbide or boride are mixed, and preformed by cold isostatic pressing (CIP). Successively, by canning the preformed material, this preformed material is sintered by hot isostatic pressing (HIP). After sintering, the can outside and end face are machined by grinding, and the billet is taken out. Square pipes are formed by extruding this billet.Type: GrantFiled: February 1, 2001Date of Patent: April 27, 2004Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Kazuo Murakami, Kazumi Ogura, Toyoaki Yasui
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Patent number: 6719947Abstract: A composite porous media for either gas or liquid flow is strong and efficient, and can readily be formed in or into a wide range of different shapes and configurations. In particular, the porous media is a composite of a metal, aerogel or ceramic foam (i.e., a reticulated inter-cellular structure in which the interior cells are interconnected to provide a multiplicity of pores passing through the volume of the structure, the walls of the cells themselves being substantially continuous and non-porous, and the volume of the cells relative to that of the material forming the cell walls being such that the overall density of the intercellular structure is less than about 30 percent theoretical density) the through pores of which are impregnated with a sintered powder or aerogel. The thickness, density, porosity and porous characteristics of the final composite porous media can be varied to conform with what is demanded by the intended use.Type: GrantFiled: May 24, 2000Date of Patent: April 13, 2004Assignee: Mott Metallurgical CorporationInventors: Sunil C. Jha, Kenneth L. Rubow, Cathy L. Cowan, Mark R. Eisenmann
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Patent number: 6716389Abstract: A process for producing sintered pellets made from blends of refractory metal and refractory metal nitride powders were found to have a higher fraction of intra-agglomerate pores than those made from the refractory metal or refractory metal nitride alone resulting in improved capacitor grade powders, anodes and finished capacitors therefrom. The pellet porosity and total intrusion volume maximizes when the mixture is in the 50-75 W/W % refractory metal nitride range. The total pellet pore surface area was found to be relatively independent of refractory metal nitride concentration above 50%. A substrate consisting of a 50/50 or 25/75 W/W % refractory metal/refractory metal nitride powder mixture should produce solid capacitors with higher capacitance recovery and lower ESR.Type: GrantFiled: October 25, 2002Date of Patent: April 6, 2004Assignee: H. C. Starck IncInventors: Terrance B. Tripp, Barbara L. Cox
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Patent number: 6712873Abstract: The invention concerns a composition for warm compaction comprising a composition comprising a water-atomised standard stainless steel powder including, in addition to iron and 10-30% by weight of chromium, optional alloying elements and inevitable impurities, 0.8%-2.0% by weight of a warm compaction lubricant.Type: GrantFiled: July 30, 2002Date of Patent: March 30, 2004Assignee: Höganäs ABInventors: Anders Bergkvist, Mikael Dahlberg
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Patent number: 6712872Abstract: The invention relates to a valve body produced by powder metallurgical methods that exhibits high thermal and wear resistance and has the following composition by weight: 0.5% to 2.0% C; 5.0% to 16% Mo; 0.2% to 1.0% P; 0.1% to 1.4% Mn; 0% to 5% Cr; 0% to 5% S; 0% to 7% W; 0% to 3% V, <2% of other elements with the remainder being Fe. It also relates to a valve fitted with such valve body.Type: GrantFiled: November 12, 2002Date of Patent: March 30, 2004Assignees: Bleistahl-Produktions GmbH, Volkswagen AktiengesellschaftInventors: Gerd Krüger, Hans-Joachim Kaschuba, Franz-Josef Schleifstein
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Patent number: 6712871Abstract: A sintered alloy composition for automotive engine valve seats, and a method for producing the same, are described. An iron base sintered alloy composition comprising vanadium carbide particles, Fe—Co—Ni—Mo alloy particles, and Cr—W—Co—C alloy particles in which the composition is dispersed in a structure of sorbite is particularly suitable for use as materials of valve seats for automotive engines which requires excellent wear resistance, high-performance, high-rotation-speed, and low-fuel-consumption.Type: GrantFiled: August 29, 2002Date of Patent: March 30, 2004Assignee: Hyundai Motor CompanyInventor: Jung Seok Oh
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Patent number: 6706240Abstract: Methods of forming niobium powders and other metal powders are described. The method involves milling the metal powders at elevated temperatures and in the presence of at least one liquid solvent. The methods of the present invention have the ability to reduce DC leakage and/or increase capacitance capabilities of metal powders when formed into capacitor anodes. The present invention further has the ability to significantly reduce the milling time necessary to form high surface area metal powders and leads to reducing the amount of contaminants in the metal powders. Metal powders such as niobium powders having reduced amount of contaminants and/or having DC leakage or capacitance capabilities are also described. A process is further described for forming a flaked metal by wet-milling a metal powder into a flaked metal wherein at least one liquid fluorinated fluid is present during the wet-milling process.Type: GrantFiled: March 11, 2002Date of Patent: March 16, 2004Assignee: Cabot CorporationInventors: Kurt A. Habecker, James A. Fife
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Patent number: 6702870Abstract: The invention concerns a process permitting the preparation of a new powder, which as such or further processed is useful within a wide variety of different fields and which has magnetic and electric properties. The powder includes at least 0.5% by weight of iron containing silicate and at least 10% by weight of metallic iron and/or alloyed iron and is prepared by a process comprising the steps of mixing an iron containing powder and a silicon containing powder; and reducing the obtained mixture at a temperature above about 450° C.Type: GrantFiled: November 25, 2002Date of Patent: March 9, 2004Assignee: Höganäs ABInventors: Lars Hultman, Nils Jonsson, Britt Benemark, Peter Grahn
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Patent number: 6699303Abstract: The invention concerns a non-stick coating (4) for cooking utensils (1) characterized in that it is selected among the group comprising (a) ceramics alone selected among titanium oxynitride, titanium suboxides, titanium subnitrides, spinels, mixed spinels; and (b) ceramo-metallic mixtures wherein the ceramics are selected among titanium oxynitrides, titanium suboxides, titanium subnitrides, spinels, cerium fluoride, silicon carbide, pyrolitic carbon, boron carbide, and the metal is titanium.Type: GrantFiled: September 27, 2002Date of Patent: March 2, 2004Assignee: DJA Dodane Jean et Associes DJA CristelInventors: Bernard Hansz, Christophe Malavolta, Emmanuel Brugger, Paul Dodane, Christian Coddet
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Patent number: 6695967Abstract: A reaction-bonded &agr;-alumina filter element is provided. The filter element includes a monolith of porous material having multiple passageways extending from one end face to an opposing end face. The monolith is extruded from a mixture containing at least aluminum metal and alumina powders in a proportion such that on sintering the volume change of the monolith is minimized. The filter body can be used as a filter or as a membrane support for crossflow or dead end flow filter elements. A method for making the filter element is also provided.Type: GrantFiled: March 13, 2002Date of Patent: February 24, 2004Assignee: CeraMem CorporationInventors: Bruce A. Bishop, Peter J. Hayward, Robert L. Goldsmith, Garry G. Haacke
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Patent number: 6696014Abstract: A sintered iron-based powder metal body with lower re-compacting load and having a high density and a method of manufacturing an iron-based sintered component with fewer pores of a sharp shape and having high strength and high density.Type: GrantFiled: October 25, 2002Date of Patent: February 24, 2004Assignee: JFE Steel CorporationInventors: Naomichi Nakamura, Satoshi Uenosono, Shigeru Unami, Masashi Fujinaga, Takashi Yoshimura, Mitsumasa Iijima, Shin Koizumi, Hiroyuki Anma, Yasuo Hatai
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Patent number: 6692582Abstract: A hard magnetic alloy in accordance with the present invention is composed of at least element T selected from the group consisting of Fe, Co and Ni, at least one rare earth element R, and boron (B). The hard magnetic alloy has an absolute value of the temperature coefficient of magnetization of 0.15%/° C. or less and a coercive force of 1 kOe, when being used in a shape causing a permeance factor of 2 or more. A hard magnetic alloy compact in accordance with the present invention has a texture, in which at least a part or all of the texture comprises an amorphous phase or fine crystalline phase having an average crystal grain size of 100 nm or less, is subjected to crystallization or grain growth under stress, such that a mixed phase composed of a soft magnetic or semi-hard magnetic phase and a hard magnetic phase is formed in the texture, and anisotropy is imparted to the crystal axis of the hard magnetic phase.Type: GrantFiled: October 26, 2000Date of Patent: February 17, 2004Assignee: Alps Electric Co., Ltd.Inventors: Akinori Kojima, Akihiro Makino, Takashi Hatanai, Yutaka Yamamoto, Akihisa Inoue
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Patent number: 6692548Abstract: A copper-based sliding material produced by sintering, comprising at least two phases of copper and/or copper alloys which phases have hardness levels different form each other, and hard particles with an average particle size of 0.1 to 10 &mgr;m which are dispersed in at least one phase with the exception of a softest phase in an amount of 0.1 to 10 vol. % of the whole copper-based sliding material, said sliding material satisfying (H2/H1)≧1.2 in which H1 is the Vickers hardness of the softest phase and in which H2 is the Vickers hardness of a phase hardest in hardness including said hard particles.Type: GrantFiled: June 25, 2001Date of Patent: February 17, 2004Assignee: Daido Metal Company Ltd.Inventors: Kenji Sakai, Naohisa Kawakami, Satoru Kurimoto, Takashi Inaba, Koichi Yamamoto, Takayuki Shibayama
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Patent number: 6689185Abstract: An object of the present invention is to provide a niobium sintered body free of reduction in the CV value, a niobium powder for use in the manufacture of the niobium sintered body, and a capacitor using the niobium sintered body. A niobium powder of the present invention has niobium and tantalum, where the tantalum is present in an amount at most of about 700 ppm by mass. A sintered body and a capacitor each is manufactured using the niobium powder.Type: GrantFiled: December 19, 2002Date of Patent: February 10, 2004Assignee: Showa Denko Kabushiki KaishaInventors: Kazumi Naito, Kazuhiro Omori
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Patent number: 6689192Abstract: Method for producing metallic nanoparticles. The method includes generating an aerosol of solid metallic microparticles, generating non-oxidizing plasma with a plasma hot zone at a temperature sufficiently high to vaporize the microparticles into metal vapor, and directing the aerosol into the hot zone of the plasma. The microparticles vaporize in the hot zone to metal vapor. The metal vapor is directed away from the hot zone and to the plasma afterglow where it cools and condenses to form solid metallic nanoparticles.Type: GrantFiled: December 13, 2001Date of Patent: February 10, 2004Assignee: The Regents of the University of CaliforniaInventors: Jonathan Phillips, William L. Perry, William J. Kroenke