Patents Examined by John N. Greaves
  • Patent number: 5500289
    Abstract: A sinterable powder mix for the production of a tungsten-based cemented carbide material, said powder mix comprising at least 70% by weight of WC, from about 2 to about 15% by weight of an iron group metal binder, and optionally up to about 15% by weight of one or more carbides, nitrides and carbonitrides of metals of the groups IVb, Vb and VIb of the periodic table; characterized in thatsaid powder mix comprises from about 1 to about 8% by weight of Ta(Nb) oxide and powdered elemental carbon in about the stoichiometric amount required for the reaction:Ta(Nb).sub.2 O.sub.5 +7C.fwdarw.
    Type: Grant
    Filed: June 20, 1995
    Date of Patent: March 19, 1996
    Assignee: ISCAR Ltd.
    Inventor: Ilan Gavish
  • Patent number: 5498483
    Abstract: A wear-resistant sintered ferrous alloy for use as a valve seat, the alloy comprising an iron-based matrix having a sorbite or pearlite structure consisting of 0.5 to 1.5% by weight of C, 0.5 to 3% by weight of Ni, 0.5 to 2% by weight of Mo, 0.1 to 8% by weight of Co, 0.05 to 1% by weight of Mn, and the balance of Fe, with unavoidable impurities, and having a Vickers hardness of from 300 to 450; hard particles A consisting of 1.5 to 2.5% by weight of C, 38 to 45% by weight of Cr, 18 to 30% by weight of W, 5 to 15% by weight of Co, 0.5 to 3% by weight of Mo, 0.03 to 0.5% by weight of Ti, and the balance of Fe, with unavoidable impurities, and having an average particle diameter of from 30 to; and hard particles B consisting of 60 to 70% by weight of Mo, 0.5 to 2% by weight of Si, and the balance of Fe, with unavoidable impurities, and having an average particle diameter of from 30 to 80 .mu.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: March 12, 1996
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kozo Ito, Yoshishige Takano
  • Patent number: 5496784
    Abstract: A coating having resistance to chemical warfare agents, comprising a cured mixture of (a) a polysiloxane having unsaturated groups available for cross-linking, (b) a polysiloxane containing reactive Si-H groups and (c) an unsaturated compound such as ethyl acrylate to prevent formation of bubbles in the coating due to the liberation of hydrogen from such Si-H groups during curing, and to provide a smooth bubble-free coating. A platinum siloxane catalyst is also employed in the mixture. A representative coating composition is a mixture of compounds (a) polydimethylsiloxane, vinyl dimethylterminated; (b) polymethylhydrosiloxane, and (c) ethyl acrylate; and platinum-divinyltetramethyldisiloxane complex catalyst. The coating composition cures at room temperature and in a relatively short period of time.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: March 5, 1996
    Assignee: McDonnell Douglas Corporation
    Inventor: Norman R. Byrd
  • Patent number: 5492771
    Abstract: An improved method of making a monolayer abrasive tool using a relatively low melting point, soft filler metal alloy braze which possesses sufficiently high yield strength combined with a relatively high ductility and low elastic modulus to produce an exceptional bond between a monolayer of superabrasive particles and the tool substrate. The steps of the brazing process include applying a layer of the filler metal alloy including a an active metal in either pre-alloyed or as a mixture with the metal alloy and a monolayer of superabrasive crystals over the filler metal layer. This assembly is heated in a mon-oxidizing atmosphere such as a vacuum to melt the alloy and braze bond the superabrasive particles to the tool substrate. The alloy bond formed possess the properties of a ductility of at least 20 percent elongation, an elastic modulus of less than 15.times.10.sup.6 or less, and a yield strength preferably at least about 45,000 to 50,000 psi.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: February 20, 1996
    Assignee: Abrasive Technology, Inc.
    Inventors: James T. Lowder, Roy F. Wielonski, Kosta L. George
  • Patent number: 5492768
    Abstract: A porous living body repairing member obtained by compression-molding a metal fiber material into a desired shape, sintering the fiber mesh body or thereafter, and imparting a compressive stress of not more than 4.00 to 40.0 MPa to provide a porous living body repairing member having a compressive elasticity of not more than 2000 MPa and a permanent deformation of not more than 1% under a stress below a compressive yield stress.The compressive yield stress becomes approximately equal to the above compressive stress, and almost complete elasticity of a permanent deformation rate of not more than 0.1% is shown with respect to a compressive stress below this compressive yield stress. Accordingly, even when the porous living body repairing member is used at a high compressive load site such as man's lumbar body, permanent deformation hardly occurs.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: February 20, 1996
    Assignee: Kyocera Corporation
    Inventors: Hideaki Okimatsu, Yasunori Tamura
  • Patent number: 5486222
    Abstract: Contact materials with the composition AgSnO.sub.2 Bi.sub.2 O.sub.3 CuO have proven themselves, particularly for low-voltage switching devices. These materials can contain an additive of other metal oxides. In addition to the required useful lifetime and suitable excess high temperature behavior, such materials are also supposed to fulfill all the requirements under short-circuit current stress. This is accomplished, according to the invention, in that the additional metal oxide is separately added stannic oxide and/or iron containing at least one element of the sixth sub-group of the periodic system. In the sintered composite material according to the invention, the other metal oxide is particularly ferric tungstate (FeWO.sub.4). Preferably, separately added SnO.sub.2 is present in combination with FeWO.sub.4.
    Type: Grant
    Filed: July 18, 1994
    Date of Patent: January 23, 1996
    Assignee: Siemens Aktiengesellschaft
    Inventor: Franz Hauner
  • Patent number: 5484662
    Abstract: A solid lubricant coating system for use with a metal interface subject to high temperatures and wet lubrication, comprising agglomerates of particles of (i) solid lubricant particles selected from the group consisting of graphite, boron nitride, molybdenum disulfide, lithium fluoride, NaF, WS.sub.2, and calcium fluoride; and (ii) steel particles fused together and bounding said solid lubricant particles at least at certain intersections, certain portions of said steel particles being air-hardened to a high hardness upon exposure of the coating to the interface at high temperatures.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: January 16, 1996
    Assignee: Ford Motor Company
    Inventor: V. Durga N. Rao
  • Patent number: 5482531
    Abstract: A powder-metallurgy-produced, essentially titanium-free, nickel-containing maraging steel article such as for use in the manufacture of die casting die components and other hot work tooling components. The article preferably contains an intentional addition of niobium. The article may be produced as a hot-isostatically-compacted, solution annealed, fully dense mass of prealloyed particles, or alternately, as a hot-isostatically-compacted, plastically deformed and solution annealed, fully dense mass of prealloyed particles.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: January 9, 1996
    Assignee: Crucible Materials Corporation
    Inventors: Kenneth E. Pinnow, Carl J. Dorsch
  • Patent number: 5482782
    Abstract: A sliding-contact material comprising a backing steel plate optionally plated with Cu, and a layer of sintered copper alloy formed on one of the surfaces of the backing steel plate, wherein the layer of sintered copper alloy consists essentially of 4 to 20 wt % Sn, 1 to 10 wt % Ni, 0.05 to 1 wt % B, and balance of Cu and incidented impurities, and does not practically include P, and the sintered copper alloy has a Vickers hardness not less than Hv 100.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: January 9, 1996
    Assignee: Daido Metal Company Ltd.
    Inventors: Tadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Tsukimitsu Higuchi, Kouki Ozaki
  • Patent number: 5482671
    Abstract: A method is provided for manufacturing interlocking parts, in which at least one part is manufactured by powder injection molding. To compensate for the amount of contraction of one of the parts manufactured by powder injection molding and, if desired, to produce an additional clearance, a separation layer of plastic material is applied between the interlocking parts. After the injection process to form the separation layer, the separation layer and the binder are removed by a binder-removing and sintering process step. The method is also applicable to powdered metal extrusion for manufacture of double-layered metal parts.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: January 9, 1996
    Assignee: fischerwerke, Artur Fischer GmbH & Co. KG
    Inventor: Wilfried Weber
  • Patent number: 5480728
    Abstract: A conductive contact for use with metal oxide superconductors is described. The conductive contact comprises a metal contact which is attached by a diffusion bonding means to a superconductive metal oxide substrate. In a preferred embodiment, diffusion bonding means comprises a metal paint which includes metal particles and an organic binder which is heated to pyrolized the organic binder and form metallic diffusion bonds to the metal contact and metal oxide substrate. The invention also comprises a method for forming the conductive contact which includes selecting the superconducting metal oxide substrate, coating the substrate with a metal paint, placing the metal contact in touching contact with the metal paint and heating the combination of materials described above to pyrolized the organic binder and coalesce the metal particles.
    Type: Grant
    Filed: January 3, 1994
    Date of Patent: January 2, 1996
    Assignee: General Electric Company
    Inventor: John E. Tkaczyk
  • Patent number: 5480468
    Abstract: Ni-base alloy foils are made directly from Ni-base alloy powders by hot pressing. These Ni-base alloy foils are characterized by having a thickness of 0.017 in. or less, and by the fact that they are fine-grained and substantially free of oxygen, nitrogen and deformation-induced defects. The as-pressed Ni-base foils are generally ductile and adapted for subsequent forming operations, including cold rolling. The reduction in thickness imparted in a single pass to a Ni-base alloy foil through cold-rolling ranged from 4-10% depending on the alloy composition. The total reduction in thickness ranged from about 10-50% based upon a plurality of such passes. For reductions in thickness greater than about 10%, annealing is employed for stress relief.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: January 2, 1996
    Assignee: General Electric Company
    Inventors: Ann M. Ritter, Melvin R. Jackson, Paul L. Dupree, Donald N. Wemple, Jr., John R. Hughes
  • Patent number: 5476632
    Abstract: A process of forming a sintered article of powder metal comprising: selecting elemental iron powder; determining the desired properties of said sintered article and selecting, a quantity of carbon, and ferro alloy from the group of ferro manganese, ferro chromium, ferro molybdenum, ferro vanadium, ferro silicon and ferro boron; grinding said ferro alloy to a mean particle size of approximately 8 to 12 microns; introducing a lubricant while blending the carbon, ferro alloy, with said elemental iron powder; pressing the mixture to form the article; and then high temperature sintering the article at a temperature between 1, C. and 1, C. in a neutral or reducing atmosphere; so as to produce the sintered article of powdered metal; and includes the product formed thereby.
    Type: Grant
    Filed: January 14, 1994
    Date of Patent: December 19, 1995
    Assignee: Stackpole Limited
    Inventors: Rohith Shivanath, Peter Jones
  • Patent number: 5476633
    Abstract: An INVAR 36 material having long-term dimensional stability is produced by sintering a blend of powders of nickel and iron under pressure in an inert atmosphere to form an alloy containing less than 0.01 parts of carbon and less than 0.1 part aggregate and preferably 0.01 part individually of Mn, Si, P, S, and Al impurities. The sintered alloy is heat treated and slowly and uniformly cooled to form a material having a coefficient of thermal expansion of less than 1 ppm/.degree.C. and a temporal stability of less than 1 ppm/year.
    Type: Grant
    Filed: July 6, 1994
    Date of Patent: December 19, 1995
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Witold M. Sokolowski, Marc S. Lane, Cheng H. Hsieh, Timothy P. O'Donnell
  • Patent number: 5472793
    Abstract: A composite spray coating comprises an iron base material, a spray coating film applied thereon and a diffusion layer of aluminum or aluminum-zinc alloy, and is used for hot-dip galvanization.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: December 5, 1995
    Assignee: Tocalo Co., Ltd.
    Inventors: Yoshio Harada, Kazumi Tani, Yoshihumi Kobayashi
  • Patent number: 5470525
    Abstract: Tantalum anode pellets or tantalum powders are treated to remove carbon content (mostly attributable to binders used in pressing the powders to pellet form and/or sintering of the pellets) by an aqueous leach at F. in lieu of the conventional complex distillation/decomposition methods.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: November 28, 1995
    Assignee: H. C. Starck, Inc.
    Inventors: Terrance B. Tripp, Malcolm Shaw
  • Patent number: 5470527
    Abstract: A sputtering target that consists essentially of a continuous matrix of Ti-W phase, Ti phase having a particle diameter of 50 .mu.m or less distributed in the matrix, and a W phase having a particle diameter of 20 .mu.m or less also distributed in the matrix. Preferably the target contains aluminum in the range of 1 ppm or less. The target has high density and a low impurity content, which reduces the generation of particles from the target when it is used for sputtering. A method of manufacturing the sputtering target is also disclosed.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: November 28, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Yamanobe, Michio Satou, Takashi Ishigami, Minoru Obata, Mituo Kawai, Noriaki Yagi, Toshihiro Maki, Shigeru Ando
  • Patent number: 5468566
    Abstract: An article and method of manufacture of (Bi, Pb)-Sr-Ca-Cu-O superconductor. The superconductor is manufactured by preparing a first powdered mixture of bismuth oxide, lead oxide, strontium carbonate, calcium carbonate and copper oxide. A second powdered mixture is then prepared of strontium carbonate, calcium carbonate and copper oxide. The mixtures are calcined separately with the two mixtures then combined. The resulting combined mixture is then subjected to a powder in tube deformation and thermal processing to produce a substantially phase pure (Bi, Pb)-Sr-Ca-Cu-O superconductor.
    Type: Grant
    Filed: September 13, 1994
    Date of Patent: November 21, 1995
    Assignee: University of Chicago
    Inventors: Stephen E. Dorris, Roger B. Poeppel, Barton C. Prorok, Michael T. Lanagan, Victor A. Maroni
  • Patent number: 5468446
    Abstract: The pelletisation or granulation of a material or mixture of materials the or at least one of which is reactive in a liquid to produce a gas is improved by treating the reactive material prior to final compaction to form a coating thereon of a substance which is less soluble in the liquid than the reactive material. The preferred reactive material is calcium hydride and the preferred coating is calcium carbonate with or without calcium hydroxide.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: November 21, 1995
    Assignees: British Aerospace PLC, BAeSEMA Ltd.
    Inventors: Peter C. Morgan, Alan D. Hart, Philip D. Morgans
  • Patent number: 5466415
    Abstract: Thick-skinned extruded metal honeycomb structures, and a method and apparatus for making them, are disclosed wherein a plasticized powder metal extrusion batch is extruded though a die assembly comprising a die and annular mask, the mask having a central outlet for extrusion of the skin and honeycomb core and an extrudate reservoir adjacent the central outlet, the die and mask cooperating to form a skinforming gap fed by the die and by the extrudate reservoir, such that batch material supplied from the reservoir and directly from the die combines to form a thickened outer skin which is integral with, and resistant to separation from, the honeycomb core.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: November 14, 1995
    Assignee: Corning Incorporated
    Inventors: Kevin R. Brundage, Lawrence S. Rajnik