Patents Examined by Leon Nigohosian, Jr.
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Patent number: 4990180Abstract: A self-sustaining combustion synthesis process for producing hard, tough, lightweight, low exothermic potential product (LEPP)/high exothermic potential product (HEPP) composites is based on the thermodynamic dependence of adiabatic temperature and product composition on the stoichiometry of the LEPP and HEPP reactants. For lightweight products the composition must be relatively rich in the LEPP component. LEPP rich composites are obtained by varying the initial temperature of the reactants. The product is hard, porous material whose toughness can be enhanced by filling the pores with aluminum or other metal phases using a liquid metal infiltration process. The process can be extended to the formation of other composites having a low exothermic component.Type: GrantFiled: September 1, 1989Date of Patent: February 5, 1991Assignee: The United States of America as represented by the United States Department of EnergyInventors: Danny C. Halverson, Beverly Y. Lum, Zuhair A. Munir
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Patent number: 4988645Abstract: Ceramic-metal composites (cermets) are made by a combination of self-propagating high temperature combustion synthesis and molten metal infiltration. Solid-gas, solid-solid and solid-liquid reactions of a powder compact produce a porous ceramic body which is infiltrated by molten metal to produce a composite body of higher density. AlN-Al and many other materials can be produced.Type: GrantFiled: December 12, 1988Date of Patent: January 29, 1991Assignee: The United States of America as represented by the United States Department of EnergyInventors: Joseph B. Holt, Stephen D. Dunmead, Danny C. Halverson, Richard L. Landingham
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Patent number: 4986461Abstract: When working material with the aid of shock-wave generating energy sources, the problem of tool fatigue occurs.This problem is reduced to a great extent by means of the inventive method, which prevents the occurrence of reflected tensile-force waves. This is achieved by permitting the pressure wave to pass into contact with porous material applied to the tool material, so that wave energy will be consumed by interference and heat generation in the porous material.Type: GrantFiled: August 31, 1989Date of Patent: January 22, 1991Assignee: Exploweld ABInventor: Per I. Persson
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Patent number: 4985072Abstract: The polycrystalline magnetic substance for magnetic refrigeration in or gas refrigeration accordance with the present invention comprises a plurality of magnetic alloy fine crystalline powders that include at least one kind of rare-earth element selected from the group of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, with the remainder metal consisting substantially of 2 kinds selected from Al, Ni, Co, and Fe, and a metallic binder which forms a compact together with the fine crystalline particles, where the abundance ratio of the metallic binder in the compact is 1 to 80% by volume.Type: GrantFiled: September 22, 1988Date of Patent: January 15, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Masashi Sahashi, Hiromi Niu, Koichiro Inomata
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Patent number: 4985071Abstract: A process for producing a thin film of a base metal on a substrate which comprises thermally decomposing in oxidative atmosphere an organic or inorganic compound containing a base metal compound formed on a substrate to form the oxide of the metal and then reducing the oxide by heat-treating it in reductive atmosphere. A temperature sensor, magnetic sensor, and ceramic wiring substrate utilizing the base metal thin film.Type: GrantFiled: January 12, 1989Date of Patent: January 15, 1991Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Munehiro Tabata, Chiharu Hayashi, Yasuhito Isozaki, Kazuyuki Okano, Yo Hasegawa
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Patent number: 4985070Abstract: There are disclosed a high strength nitrogen-containing cermet which comprises 7 to 20% by weight of a binder phase composed mainly of Co and/or Ni, with the balance being a hard phase composed mainly of TiC, TiN and/or Ti(C,N) and inevitable impurities, wherein the hard phase comprises 35 to 59% by weight of Ti, 9 to 29% by weight of W, 0.4 to 3.5% by weight of Mo, 4 to 24% by weight of at least one of Ta, Nb, V and Zr, 5.5 to 9.5% by weight of N and 4.5 to 12% by weight of C; and a process for preparing the same which comprises via the formulating, mixing, drying, molding and sintering steps of Co and/or Ni powder, at least one powder of TiC, Ti(C,N) and TiN, WC powder, Mo and/or Mo.sub.2 C, and at least one powder of carbides of Ta, Nb, V and Zr, wherein the sintering step is carried out by elevating the temperature up to 1350.degree. C. in vacuum, with the nitrogen atmosphere being made 1 torr at 1350.degree. C.Type: GrantFiled: July 21, 1989Date of Patent: January 15, 1991Assignee: Toshiba Tungaloy Co., Ltd.Inventors: Kozo Kitamura, Takeshi Saitoh, Mitsuo Ueki, Keiichi Kobori
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Patent number: 4980239Abstract: A metallization layer structure includes an intermediate layer formed on an aluminum nitride ceramics base. The intermediate layer contains aluminum titanium nitride. A titanium layer is formed on the intermediate layer. A heat-resistant metallic layer is formed on the titanium layer. A metallic layer for facilitating soldering or brazing is formed on the heat-resistant metallic layer.Type: GrantFiled: August 24, 1988Date of Patent: December 25, 1990Assignee: Fujitsu LimitedInventors: Shigeki Harada, Masahiro Sugimoto
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Patent number: 4978582Abstract: The invention concerns three-layer composites with their plastic core so uniformly enriched with an appropriate percentage by volume of a ferrosilicon with an appropriate particle size that the composites can be securely joined to each other and to sheets of metal alone by resistance welding. The property applies to composites with either a viscously elastic or an impact-resistant core.Type: GrantFiled: October 11, 1989Date of Patent: December 18, 1990Assignee: Hoesch Stahl AGInventors: Klaus Stamm, Ulrich Tenhaven
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Patent number: 4978498Abstract: A method of removing a binder from a green body capable of accomplishing the binder removal at a substantially reduced temperature and in a significantly reduced period of time. The binder mainly consists of a polymer material of ultraviolet degradation properties such as, for example, a polymer material having a main chain containing a tertiary carbon atom. The green body is irradiated with ultraviolet rays at a temperature within the range of 150.degree. C. to 300.degree. C. under an atmospheric pressure to rapidly carry out the photo degradation of the polymer material by ultraviolet rays, so that the binder may be readily removed from the green body.Type: GrantFiled: February 14, 1990Date of Patent: December 18, 1990Assignee: Nippon Welding Rod Company, Ltd.Inventors: Yoshiro Yoshihiro, Masahiro Adachi, Minoru Imai
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Patent number: 4973357Abstract: An orthodontic bracket and method of making same wherein the bracket has at least one tiewing integrally formed with a base portion. In one form of the invention the bracket is provbided with at least one longitudinally extending groove which extends into the base portion, the groove having at least a portion extending beyond at least a portion of the groove opening. In another aspect of the present invention is directed to a method of making an orthodontic bracket using ultrasonic machining techniques.Type: GrantFiled: December 4, 1989Date of Patent: November 27, 1990Assignee: Manufacturers Hanover Trust CompanyInventors: James F. Reher, Farrokh Farzin-Nia
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Patent number: 4973356Abstract: The present invention relates to a method of preparing an alloy for use as a cutting tool material comprising hard principles and binder phase by which a uniform distribution of the hard principles in the binder phase is obtained, and the resulting product.Type: GrantFiled: October 23, 1989Date of Patent: November 27, 1990Assignee: Sandvik ABInventors: Peder von Holst, Hakan Morberg, Rolf Oskarsson
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Patent number: 4971755Abstract: It is disclosed a method for preparing a large-sized powder metallurgical sintered product having a superior characteristic by charging mixtures of three types of metallic powder composed of coarse particles, middle particles and fine particles into the molding die while vibrating it, heating the charged material together with the molding die, sintering them, and infiltrating metal of low melting point into the sintered body. According to this method, it is possible to get a large-sized sintered body having a superior strength and surface smoothness or a sintered body prohibiting any cracks or slits by arranging the proper particle size.Type: GrantFiled: June 20, 1989Date of Patent: November 20, 1990Assignee: Kawasaki Steel CorporationInventors: Masaki Kawano, Kuniaki Ogura, Shigeaki Takajo, Hiroshi Ohtsubo, Keisuke Yoshimura, Yoshiaki Maeda
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Patent number: 4970049Abstract: Sintered ferrous materials are described having a composition in wt % lying within the ranges of C 0.8-1.5/W 1-4.4/Mo 1-4.4/V 1-2.6/Cr 1.3-3.2/Others 3 max./Fe balance. The material may be made by a method comprising the steps of mixing between 40 and 70 wt % of a powder having a composition in wt % within the ranges C 0.45-1.05/W 2.7-6. 2/Mo 2.8-6.2/V 2.8-3.2/Cr 3.8-4.5/Others 3.0 max./Fe balance with between 60 and 30 wt % of an iron powder and from 0.4 to 0.9 wt % of carbon powder, pressing a green body of the article from the mixed powder and then sintering the green body. The material may optionally contain sulphur, metallic sulphides. The material may be infiltrated.Type: GrantFiled: October 6, 1988Date of Patent: November 13, 1990Assignee: Brico Engineering LimitedInventors: Andrew R. Baker, Richard L. Kettle
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Patent number: 4966626Abstract: A sintered ferro alloy comprises 5 to 25 wt % of one or two elements selected from Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one element selected from borides of La, Ce, Nd, Sm, Eu, Gd, Yb, Y or Sc, residual Fe, and contaminants. Also the alloy may comprise less than or equal to 20 wt % of at least one element selected from V, Nb, Ta, Ti, Zr, Hf, Co or Ni, if necessary. The alloy is produced by mixing the above mentioned components and pressurizing them in an Fe matrix, then sintering the pressurized mixture at 1150.degree. C. to 1260.degree. C. for 60 min. and reheating after sintering. This alloy has wear and heat resistance and can be utilized as valve seats for internal combustion engines in automotive vehicles.Type: GrantFiled: June 28, 1989Date of Patent: October 30, 1990Assignees: Nissan Motor Company, Limited, Hitachi Powdered Metals Company, LimitedInventors: Akira Fujiki, Yoshiteru Yasuda, Hiroyuki Endo, Yutaka Ikenoue, Keitaro Suzuki
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Patent number: 4966816Abstract: A pack assembly for use in hot rolling a material sensitive to heat loss, such as gamma titanium aluminide. The pack assembly has a pair of opposed deformable metal cover plates adjacent opposite outer major surfaces of at least one flat product of the material to be hot rolled positioned between the cover plates. A continuous thermal barrier is positioned between each of the outer major surfaces of each of the cover plates.Type: GrantFiled: June 7, 1989Date of Patent: October 30, 1990Assignee: Titanium Metals Corporation of America (TIMET)Inventors: Tommie L. Wardlaw, Paul J. Bania
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Patent number: 4966811Abstract: A moulded body having an inner support matrix is enveloped at least partially with a plastic envelope making up the mould. The support matrix is formed at least partially from metal wire pieces and/or metal chips, which are compression moulded and sintered.Type: GrantFiled: August 23, 1989Date of Patent: October 30, 1990Assignee: Schaebische Huettenwerke GmbHInventor: Hans A. Haerle
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Patent number: 4966627Abstract: A composite material is disclosed along with the method of making the same. The material comprises a tough grade of cemented carbide granule dispersed with a hard brittle grade of cemented carbide granules to form a matrix. The quantity of hard, brittle cemented carbide granules is between 20% to 60% of the total composition. Such material functions to improve wear resistance without sacrificing toughness.Type: GrantFiled: August 4, 1988Date of Patent: October 30, 1990Assignee: Smith International, Inc.Inventors: Madapusi K. Keshavan, Proserfina C. Rey
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Patent number: 4964909Abstract: A heat-insulating component consists of a porous body obtained by moulding and sintering an iron-base powder having an admixture of 2-10% by weight of silicon, preferably 4-8% by weight. A method of making the heat-insulating component includes the steps of preparing an iron-base powder mixture with an admixture of 2-10% by weight of silicon, preferably 4-8% by weight; optionally supplying the powder with further admixtures in the form of 3-12% by weight of maganese, preferably 5-10% by weight, up to 25% by weight of chromium, up to 15% by weight of nickel, up to 2.5 % by weight of molybdenum and up to 2% by weight of carbon, moulding the powder mixture into a body of desired shape, and sintering the body for obtaining a porous component having a coefficient of thermal conductivity below about 12 W/m.degree.K, preferably below 7 W/m.degree.K.Type: GrantFiled: January 4, 1989Date of Patent: October 23, 1990Assignee: Hoganas ABInventors: Ulf Engstrom, Olavi Mustonen
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Patent number: 4965044Abstract: The present invention relates to a method of sintering ceramics and ceramics obtained by said method. According to the present invention, the synthesis and sintering of ceramics can be simultaneously carried out by utilizing the reaction heat generated when at least one metallic element selected from metallic elements of IIb, IVb, Vb and VIb groups of the Periodic Table is combined with at least one nonmetallic element such as B, C N and Si without heat or by preliminarily heating the ceramics at temperatures remarkably lower than the usual sintering temperature ceramics thus-produced are superior in abrasion resistance and corrosion resistance.Type: GrantFiled: August 11, 1989Date of Patent: October 23, 1990Assignees: I. Sumitomo Electric Industries, Ltd., Yoshinari Miyamoto, Osamu Yamada, Mitsue KoizumiInventors: Yoshinari Miyamoto, Osamu Yamada, Mitsue Koizumi, Osamu Komura, Eiji Kamijo, Masaaki Honda, Akira Yamakawa
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Patent number: H845Abstract: Vanadium alloys and their fabrication to produce materials for fusion applications having small additions of Ti, C and Zr that improve resistance to helium embrittlement.Type: GrantFiled: May 16, 1990Date of Patent: November 6, 1990Assignee: The United States of America as represented by the United States Department of EnergyInventors: David N. Braski, Philip J. Maziasz