Patents by Inventor Helmut Lingertat

Helmut Lingertat has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6967330
    Abstract: This invention encompasses the oxides of lutetium and silicon in various proportions and containing a dopant, optionally cerium, fabricated in the form of a translucent ceramic, and methods of manufacture and use of such ceramic.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: November 22, 2005
    Assignee: ALEM Associates
    Inventors: Alex Lempicki, Charles Brecher, Helmut Lingertat, Vinod K. Sarin
  • Patent number: 5271758
    Abstract: A dense cermet article including about 44-93% of a granular first hard phase, about 4-44% of a granular second hard phase, and about 2-20% of a metal phase, all expressed in % by volume. The first hard phase consists essentially of alumina and from 0% to less than 5% of one or more oxides selected from magnesia, zirconia, yttria, hafnia, and silica. The second hard phase consists essentially of a hard refractory carbide, nitride, or boride, or mixture or solid solution thereof. Preferred materials for inclusion in the second hard phase are titanium carbide, hafnium carbide, tantalum carbide, tantalum nitride, tungsten carbide, titanium diboride, and boron carbide. The metal phase consists essentially of a combination of nickel and aluminum having a ratio of nickel to aluminum of from about 85:15 to about 88:12, and 0-5% of an additive selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, cobalt, boron, and/or carbon.
    Type: Grant
    Filed: May 13, 1991
    Date of Patent: December 21, 1993
    Assignee: Valenite Inc.
    Inventors: Sergej T. Buljan, Helmut Lingertat, Steven F. Wayne
  • Patent number: 5216845
    Abstract: A method for machining a high temperature nickel based alloy workpiece or other difficult-to-work material. The method involves machining the workpiece at an effective cutting speed of up to about 1500 sfm per minute, moving a ceramic-metal cutting tool across the face of the workpiece at a rate of up to about 0.04 in/rev, and cutting the workpiece with the ceramic-metal cutting tool to effect a depth of cut of up to about 0.15 inches per pass. The ceramic-metal cutting tool has a density of at least about 95% of theoretical, and includes about 80-98%, preferably 88-96%, by volume of granular hard phases and about 2-20%, preferably 4-12%, by volume of a metal phase. The granular hard phases are (a) a major hard phase portion of alumina and (b) a minor hard phase portion of hard refractory metal carbides, nitrides, carbonitrides, and borides.
    Type: Grant
    Filed: April 30, 1991
    Date of Patent: June 8, 1993
    Assignee: GTE Valenite Corporation
    Inventors: Sergej-Tomislav Buljan, Helmut Lingertat, Steven F. Wayne
  • Patent number: 5089047
    Abstract: A dense cermet article including about 80-95% by volume of a granular hard phase and about 5-20% by volume of a metal phase. The granular hard phase consists essentially of a ceramic material selected from the hard refractory carbides, nitrides, carbonitrides, oxycarbides, oxynitrides, carboxynitrides, and borides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, boron, and mixtures thereof. The metal phase consists essentially of a combination of nickel and aluminum having a weight ratio of nickel to aluminum of from about 90:10 to about 70:30 and 0-5% by weight of an additive selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, cobalt, boron, or carbon, or combinations thereof. In the preferred metal phase, an amount of about 15-80% by volume of the metal phase component exhibits a Ni.sub.3 Al ordered crystal structure.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: February 18, 1992
    Assignee: GTE Laboratories Incorporated
    Inventors: Sergej T. Buljan, Helmut Lingertat, Steven F. Wayne
  • Patent number: 5053074
    Abstract: A dense cermet article including about 80-90% by volume of a granular hard phase and about 5-20% by volume of a metal phase. The hard phase is a carbide, nitride, carbonitride, oxycarbide, oxynitride, or carboxynitride of a cubic solid solution selected from W-Ti, W-Hf, W-Nb, W-Ta, Zr-Ti, Hf-Ti, Hf-Zr, V-Ti, Nb-Ti, Ta-Ti, or Mo-Ti. The metal phase consists essentially of a combination of nickel and aluminum having a ratio of nickel to aluminum of from about 90:10 to about 70:30 by weight, and 0-5% by weight of an additive selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, cobalt, boron, and/or carbon. The preferred hard phase is a cubic solid solution of tungsten and titanium. In the preferred metal phase, an amount of about 15-80% by volume of the metal phase component exhibits a Ni.sub.3 Al ordered crystal structure. The article may be produced by presintering the hard phase - metal phase component mixture in a vacuum or inert atmosphere at about 1475.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: October 1, 1991
    Assignee: GTE Laboratories Incorporated
    Inventors: Sergej T. Buljan, Helmut Lingertat, Steven F. Wayne
  • Patent number: 5041261
    Abstract: A method for manufacturing a dense cermet article including about 80-95% by volume of a granular hard phase and about 5-20% by volume of a metal binder phase. The hard phase is (a) the hard refractory carbides, nitrides, carbonitrides, oxycarbides, oxynitrides, carboxynitrides, borides, and mixtures thereof of the elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and B, or (b) the hard refractory carbides, nitrides, carbonitrides, oxycarbides, oxynitrides, and carboxynitrides, and mixtures thereof of a cubic solid solution of Zr--Ti, Hf--Ti, Hf--Zr, V--Ti, Nb--Ti, Ta--Ti, Mo--Ti, W--Ti, W--Hf, W--Nb, or W--Ta. The binder phase is a combination of Ni and Al having a Ni:Al weight ratio of from about 85:15 to about 88:12, and 0-5% by weight of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Co, B, and/or C. The method involves presintering the hard phase/binder phase mixture in a vacuum or inert atmosphere at about 1475.degree.-1675.degree. C., then HIPing at about 1575.degree.-1675.degree. C.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: August 20, 1991
    Assignee: GTE Laboratories Incorporated
    Inventors: Sergej T. Buljan, Helmut Lingertat, Steven F. Wayne
  • Patent number: 4708037
    Abstract: A steel roughing grade coated cemented carbide cutting tool comprises WC grains equal to or less than 70 w/o of the tool substrate, from about 5 to about 10 w/o of a cobalt bonding phase and the remainder being metal carbide grains selected from the group TiC, TaC, NbC, HfC and combinations thereof. The average WC grain size is from about 0.9 to about 1.3 microns and less than 10% of the WC grains have a size less than 0.5 microns. The coated cemented carbide tool is coated with an adherent refractory coating layer. The coated cemented carbide cutting tool can be used to machine steel at rough and heavy rough cutting conditions.
    Type: Grant
    Filed: December 19, 1986
    Date of Patent: November 24, 1987
    Assignee: GTE Laboratories Incorporated
    Inventors: Sergei-Tomislav V. Buljan, Helmut Lingertat, J. Gary Baldoni, II, Vinod K. Sarin
  • Patent number: 4698266
    Abstract: A steel roughing grade coated cemented carbide cutting tool comprises WC grains equal to or less than 70 w/o of the tool substrate, from about 5 to about 10 w/o of a cobalt bonding phase and the remainder being metal carbide grains selected from the group TiC, TaC, NbC, HfC and combinations thereof. The average WC grain size is from about 0.9 to about 1.3 microns and less than 10% of the WC grains have a size less than 0.5 microns. The coated cemented carbide tool is coated with an adherent refractory coating layer. The coated cemented carbide cutting tool can be used to machine steel at rough and heavy rough cutting conditions.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: October 6, 1987
    Assignee: GTE Laboratories Incorporated
    Inventors: Sergei-Tomislav V. Buljan, Helmut Lingertat, J. Gary Baldoni, Vinod K. Sarin
  • Patent number: 4603116
    Abstract: A method of preparing fully dense silicon nitride based ceramic articles comprises the steps of blending a metal oxide component and silicon nitride, wherein a portion of the silicon nitride comprises acicular crystals; comminuting the powder mixture to reduce the aspect ratio of the acicular crystals to an average of less than about 3; pressing the comminuted powder to form a compact; and pressureless sintering the compact to a fully dense ceramic body. Powder mixtures and powder compacts for forming fully dense silicon nitride based ceramic bodies are also disclosed.
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: July 29, 1986
    Assignee: GTE Laboratories Incorporated
    Inventors: J. Thomas Smith, Carr Lane W. Quackenbush, Anthony P. Moschetti, Helmut Lingertat
  • Patent number: 4400427
    Abstract: Sintered silicon nitride-silica-yttria ceramic articles having silica-rich or yttria-rich casing layers are disclosed. The surface layers are formed by sintering pre-compacted bodies in a powder setter bed to produce unitary sintered bodies having surface layers in which the atom ratio of yttrium to silicon has a smooth gradient from the surface of the article to the interior body of the article.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: August 23, 1983
    Assignee: GTE Laboratories Incorporated
    Inventors: Anthony P. Moschetti, J. Thomas Smith, Carr L. W. Quackenbush, Helmut Lingertat, Vincent W. Nehring
  • Patent number: 4383958
    Abstract: Dense, composite, polycrystalline ceramic articles comprising silicon nitride, silicon dioxide, and yttrium oxide and having thin surface layers of controlled composition are formed by sintering pre-pressed compacts embedded in setter bed powder mixtures having compositions of silicon nitride, silicon dioxide, and yttrium oxide which differ from that of the pressed compact.Employing the method of this invention, articles are produced which have surface layers in which the minor phase of the article is enriched with either yttrium or silicon.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: May 17, 1983
    Assignee: GTE Laboratories Incorporated
    Inventors: Anthony P. Moschetti, J. Thomas Smith, Carr L. W. Quackenbush, Helmut Lingertat, Vincent W. Nehring
  • Patent number: 4022870
    Abstract: This application describes a process for the catalytic reduction of sulfur dioxide in gas streams containing sulfur dioxide to elemental sulfur using a reducing gas such as hydrogen or, preferably, carbon monoxide, in a reactor charged with a material represented by the formula Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd.In a further aspect of this invention, a gas stream containing hydrogen sulfide or carbonyl sulfide and sulfur dioxide is passed through a reaction chamber charged with Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd, to catalytically produce at a sufficiently elevated temperature elemental sulfur with concomitant reduction of the concentrations of the undesired hydrogen sulfide or carbonyl sulfide and sulfur dioxide.
    Type: Grant
    Filed: July 16, 1975
    Date of Patent: May 10, 1977
    Assignee: GTE Laboratories Incorporated
    Inventors: Frank C. Palilla, Gary G. Gaudet, Helmut Lingertat
  • Patent number: 3931390
    Abstract: This application describes a process for the catalytic reduction of sulfur dioxide in gas streams containing sulfur dioxide to elemental sulfur using a reducing gas such as hydrogen or, preferably, carbon monoxide, and a catalyst of the formula Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: January 6, 1976
    Assignee: GTE Laboratories Incorporated
    Inventors: Frank C. Palilla, Gary G. Gaudet, Helmut Lingertat