Patents Examined by David W. Schumaker
  • Patent number: 5002733
    Abstract: A method of making a silicon alloy, and preferably a ferrosilicon alloy, having a controlled calcium content and optionally rare earth constituents wherein the calcium and rare earth constituents are separately introduced into the ferrosilicon smelting furnace in briquette form. The calcium briquettes comprise a compressed and cured mixture of calcium carbonate, preferably in the form of pulverized limestone, a carbon source, such as carbon black, and a binder. The briquetted calcium carbonate dissociates as it is heated during its descent in the smelting furnace and transforms to calcium oxide. The resultant calcium oxide reacts with the carbon in the briquette in the high temperature smelting zone to yield calcium carbide which then reacts with silica to form calcium silicide which then enters into solution with the molten ferrosilicon alloy.
    Type: Grant
    Filed: July 26, 1989
    Date of Patent: March 26, 1991
    Assignee: American Alloys, Inc.
    Inventors: Ernest J. Breton, Jan R. Leszcynski, Michael A. Merritt, John O. Staggers
  • Patent number: 5001020
    Abstract: Disclosed herein is a multifilament superconducting wire of Nb.sub.3 Al comprising a core part of copper or copper alloy which is provided in a central portion as a stabilizing material and a peripheral part which is provided around the core part and formed by an Nb.sub.3 Al filament embedded in a matrix of copper or copper alloy, such that the ratio of copper or copper alloy forming the core part and the peripheral part to the Nb.sub.3 Al filament is at least 1 and not more than 5 in sectional area ratio and the diameter of the core part is at least 1/5 of the wire diameter.
    Type: Grant
    Filed: June 19, 1990
    Date of Patent: March 19, 1991
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazuya Ohmatsu, Masayuki Nagata
  • Patent number: 4999158
    Abstract: This invention relates to iron-base alloy compositions, nickel containing austenitic ferrous alloy compositions (especially low nickel compositions) and dopants added to low nickel austenitic alloys as a means of improving the elevated temperature oxidation resistance of the resultant material.
    Type: Grant
    Filed: November 2, 1988
    Date of Patent: March 12, 1991
    Assignee: Chrysler Corporation
    Inventor: John M. Corwin
  • Patent number: 4999053
    Abstract: A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of:(a) holding a molten alloy in a container selected from the group consisting of a lime crucible, a lime crucible furnace, a converter and a ladle lined with a basic refractory consisting of 15-85% of calcium oxide (CaO), and 15-75% of magnesium oxide (MgO), wherein said alloy consists essentially of at least one major ingredient selected from the group consisting of iron (Fe), nickel (Ni), and cobalt (Co);(b) adding at least one additive, based on the molten alloy, into said molten alloy in an atmosphere selected from the group consisting of a non-oxidizing atmosphere and a vacuum, wherein said additive is selected from the group consisting of aluminum (Al), aluminum alloys, silicon and silicon alloys;(c) desulphurizing, deoxidizing and denitrifying said molten alloy under an atmosphere
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: March 12, 1991
    Assignees: Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
    Inventors: Tohei Ototani, Toru Degawa, Kanicki Kusumoto, Makoto Ebata
  • Patent number: 4995920
    Abstract: A process for the production of a series 7000 aluminum alloy (Al-Zn-Cu-Mg) with a high level of mechanical strength and good ductility, by spray deposition. The object is the production of aluminum alloys having an ultimate stress.gtoreq.800 MPa and an elongation.gtoreq.5%, as well as the production of alloys which are reinforced by ceramic particles. According to the process, a solid alloy is formed by spray deposition, the alloy is transformed in the hot condition at between 300.degree. and 450.degree. C. and possibly in the cold condition, and the transformed alloy is subjected to solution treatment, quenching and aging.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: February 26, 1991
    Assignee: Pechiney Recherche Groupement d'Interet Economique
    Inventors: Jean-Francois Faure, Bruno Dubost
  • Patent number: 4996118
    Abstract: A composite metal plated article excellent in mold-releasability, which comprises an article to be plated and a composite metal plating layer, formed on at least one surface of the article to be plated, in which particles of a synthetic resin as a mold-releasing agent are uniformly dispersed. The above-mentioned synthetic resin comprises a modified silicone oil having a structure in which a plurality of repeated units of a fluorine atoms substituted olefin are combined with silicone oil.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: February 26, 1991
    Assignee: NKK Corporation
    Inventors: Akiyoshi Okado, Masaki Abe, Hiroshi Kagechika, Shinichi Kagaya
  • Patent number: 4992297
    Abstract: This invention relates to novel alloys suitable for use in making dental restoration elements, such as crowns, inlays, and the like, and ornamental articles such as jewelry, ornaments and the like. The alloys are based on Pd, In and Ag and contain 25-50% by weight of Pd, 20-45% by weight of In and 20-50% by weight of Ag. The alloys may additionally contain minor proportions of certain other elements, they are castable, and have an esthetic yellow color.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: February 12, 1991
    Assignee: Elephant Edelmetaal B.V.
    Inventor: Joseph M. van der Zel
  • Patent number: 4988392
    Abstract: Directed to the production of composite copper-molybdenum sheet by assembling at least one plate of molybdenum with at least one plate of dispersion-strengthened copper to form a composite billet, heating the billet in a protective atmosphere to a temperature within the hot working range for copper, working the billet in a protective atmosphere to effect a reduction in thickness of at least about 40% to bond said dispersion-strengthened copper and said molybdenum together and thereafter further working the resulting bonded billet.
    Type: Grant
    Filed: May 16, 1990
    Date of Patent: January 29, 1991
    Inventors: Richard D. Nicholson, Ronald S. Fusco
  • Patent number: 4985202
    Abstract: A method is taught for the in-situ precipitation of second phase materials, such as ceramic or intermetallic particles, in a substantial volume fraction of solvent metal matrix. The invention involves the propagating reaction of the second phase-forming constituents in a solvent metal medium to provide a porous composite of finely-dispersed second phase particles in the metal matrix. Exemplary materials include titanium carbide or titanium diboride in an aluminum matrix.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: January 15, 1991
    Assignee: Martin Marietta Corporation
    Inventors: William C. Moshier, John M. Brupbacher, Leontios Christodoulou, Dennis C. Nagle
  • Patent number: 4981646
    Abstract: The present invention is directed to air-meltable, castable, workable alloys resistant to hot or cold chlorides and variety of chemical streams. The alloys consist essentially of, by weight, between about 20% and about 24% nickel, from about 22% to about 25% chromium, from about 5% to about 7% molybdenum, from about 0.7% to about 3.5% copper, up to about 0.08% carbon, up to about 0.35% nitrogen, up to about 0.8% columbian (niobium), up to about 1.5% manganese, up to about 1% silicon, and the balance essentially iron. Up to about 0.3% cobalt can also be present as an element naturally coexisting in certain ore deposits as a sister element to nickel and considered here to be part of the nickel content. The alloys of the present invention are of single phase austenitic matrices.
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: January 1, 1991
    Assignee: Carondelet Foundry Company
    Inventor: John H. Culling
  • Patent number: 4978587
    Abstract: A multilayer sliding material which is used, in particular, as the material of the bearings in internal combustion engines, comprising a steel backing layer, a bearing layer of copper-based alloy bonded to the steel backing layer, a silver or silver alloy plating layer bonded to the bearing layer, and a surface layer of lead-based alloy bonded to the silver or silver alloy plating layer, the silver or silver alloy plating layer having a thickness of more than 3 microns but not more than 50 microns. The multilayer sliding material having a thick plating layer of silver or silver alloy, excels in seizure-resisting.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: December 18, 1990
    Assignee: Daido Metal Company Ltd.
    Inventors: Sanae Mori, Masaaki Sakamoto, Motomu Wada, Hideo Ishikawa
  • Patent number: 4978585
    Abstract: A method of altering the crystal form of an alloy is disclosed. To accomplish this change in crystal form, the concentrations of the more volatile constituents of the alloy are reduced and the concentration of the less volatile constituents is increased on a relative basis. The process may be carried out in forming a reinforced structure. For this purpose, an improved reinforced matrix and a method of forming it are taught. The reinforcement may be silicon carbide filaments or other reinforcing filaments. The matrix is a titanium 1421 alloy nominally containing 14 weight percent of aluminum and 21 weight percent of niobium. The matrix is formed by plasma-spray forming a powder of the alloy to impart to the alloy particles a superheat during the plasma-spraying as the particles traverse the plasma plume. As a result of the superheat, the alloy is changed in its composition to reduce the aluminum concentration and to increase the niobium and titanium concentrations on a relative basis.
    Type: Grant
    Filed: January 2, 1990
    Date of Patent: December 18, 1990
    Assignee: General Electric Company
    Inventors: Ann M. Ritter, Paul A. Siemers, Donald R. Spriggs
  • Patent number: 4976777
    Abstract: Disclosed is a graded metal powder for metallic pigment, comprising a metal powder wherein the metal powder has a mean particle size of from about 2.5 to about 15.0 .mu.m, the content of particles having a particle size of not greater than 1 .mu.m is not larger than about 0.5% by volume, and the metal powder has a particle size distribution such that not smaller than 97% by volume of the particles of the metal powder fall within the range between half the mean particle size of the metal powder and double the mean particle size of the metal powder. Also is disclosed a process for producing a graded metal powder by classifying metal particles dispersed in a mineral oil containing a nonionic-anionic surfactant.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: December 11, 1990
    Assignee: Showa Alumi Powder Kabushiki Kaisha
    Inventors: Sinya Ozawa, Katsumi Kondo, Kajin Saito
  • Patent number: 4975333
    Abstract: Methods for manufacturing compressible and sinterable metal powders are provided by this invention which include contacting core metal particles with a sol of a precursor of a metal. The sol has a viscosity of from about 10-10.sup.5 centipoise and comprises at least 1.0 weight percent of the precursor in a liquid medium. The final coating is produced by removing the liquid from the sol and then converting the precursor to form a substantially uniform layer of a Cu-Ni-Mo alloy on the surfaces of the soft iron or steel core metal particles.
    Type: Grant
    Filed: March 15, 1989
    Date of Patent: December 4, 1990
    Assignee: Hoeganaes Corporation
    Inventors: James R. Johnson, William J. Mueller, David R. Walsh
  • Patent number: 4971866
    Abstract: In manufacturing contact materials which satisfy all the criteria required for use in vacuum switches as to chopping current, circuit breaking performance, withstanding voltage, welding separation force and wear, Cu powder and Ta.sub.2 O.sub.5 powder are mixed, and compressed while heating below the melting point of Cu in a nonoxidizing atmosphere. Alternatively a green compact is first manufactured from Ta.sub.2 O.sub.5 powder or a mixture of Ta.sub.2 O.sub.5 and Cu powder, and molten Cu is made to infiltrate into the compact. Preparing a green compact from a mixture of Cu powder and Ta.sub.2 O.sub.5 powder, it may be sintered at a temperature below the melting point of Cu, re-pressed, and resintered at 400.degree.-900.degree. C. in a nonoxidizing atmosphere.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: November 20, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Eizo Naya, Mitsuhiro Okumura
  • Patent number: 4968663
    Abstract: Ductile, composite superconductors having a continuous Re-Ba-Cu-O type or Bi-Sr-Ca-Cu-O type phases and a continuous noble metal phase and a process for their preparation are disclosed.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: November 6, 1990
    Assignee: Polytechnic University
    Inventor: Sung H. Whang
  • Patent number: 4964906
    Abstract: A process for controlling the oxygen content in tantalum material comprising heating the material under a hydrogen-containing atmosphere in the presence of a tantalum getter metal having an initial oxygen content lower than the tantalum material.
    Type: Grant
    Filed: September 26, 1989
    Date of Patent: October 23, 1990
    Inventor: James A. Fife
  • Patent number: 4960654
    Abstract: A metal composition comprising zinc oxide whiskers dispersed in a metal matrix. The whiskers comprise at least one needle crystal having a basal part whose diameter is from 0.7 to 14 micrometers and a length from the basal part to its tip of from 3 to 200 micrometers. The metal composition is isotropically reinforced with respect to mechanical strength and is significantly improved in free cuttability.
    Type: Grant
    Filed: August 29, 1989
    Date of Patent: October 2, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Minoru Yoshinaka, Eizo Asakura, Mitsumasa Oku, Takeshi Hamabe, Motoi Kitano, Hideyuki Yoshida
  • Patent number: 4959276
    Abstract: A heat-resistant, wear-resistant and high-strength Al-Si alloy, wherein(A) 3 to 5% by weight based on the total amount of the alloy of alumina particles having a maximum particle diameter of 30 .mu.m or less and an average particle diameter of 10 .mu.m or less and having shaped with no sharp edge and(B) 0.5 to 3% by weight based on the total amount of the alloy of graphite particles having a maximum particle diameter of 10 .mu.m or less as measured on a cross section of the Al-Si alloy structureare dispersed in a matrix consisting essentially of ingredients for an Al-Si alloy and having primary Si crystals, the sizes of the primary Si crystals being not larger than 10 .mu.m.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: September 25, 1990
    Assignees: Sumitomo Electric Industries, Ltd., Honda Motor Co., Ltd.
    Inventors: Yoshitoshi Hagiwara, Eitaro Koya, Tetsuya Hayashi, Yoshinobu Takeda
  • Patent number: 4957821
    Abstract: Aluminum-molybdenum composite sheet is produced by assembling aluminum and molybdenum sheets to form a billet, rolling the assembled billet in a protective atmosphere at a temperature of about 100.degree. to 400.degree. C. to affect a reduction in thickness of at least about 40% to provide a bonded billet. The billet can be further reduced by hot and/or cold rolling.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: September 18, 1990
    Assignee: AMAX Inc.
    Inventors: Richard D. Nicholson, Sandeep Jain