Patents by Inventor David Francis Lupton
David Francis Lupton 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).
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Patent number: 6408929Abstract: In the production of precision castings by centrifugal casting with controlled solidification, a melt is cast under vacuum or shield gas into a pre-heated mold (15) with a central gate (19) and several mold cavities proceeding from the gate toward the outer circumference (Da) of the mold (15). To prevent the formation of shrinkholes and porous areas in the castings, to save energy, and to increase the production rate, the mold (15) is operated at temperatures which decrease from the inside toward the outside. The mold consists of a material or material combination with a coefficient of thermal conductivity lower than that of copper. Before the melt is poured, the mold (15) is heated, starting from the gate (19), by a heating device (20), which projects into the gate, so that the gate (19) reaches a temperature which is a function of the material being cast. Heating is carried out at a rate sufficient to produce a temperature Gradient of at least 100° C., preferably of 200-600° C.Type: GrantFiled: May 4, 2001Date of Patent: June 25, 2002Assignees: Ald Vacuum Technologies AG, W. C. Heraeus GmbH & Co. KGInventors: Alok Choudhury, Harald Scholz, Matthias Blum, Georg Jarczyk, Marek Gorywoda, David Francis Lupton
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Publication number: 20020058181Abstract: A hydrogen permeation membrane including a niobium alloy with 5-25 wt. % of at least one element from the group consisting of palladium, ruthenium, rhenium, platinum, gold, and rhodium.Type: ApplicationFiled: November 5, 2001Publication date: May 16, 2002Applicant: W. C. Heraeus GmbH & Co. KGInventors: Uwe Jantsch, Harald Manhardt, David Francis Lupton
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Publication number: 20020056491Abstract: A gold-free platinum material that is dispersion-strengthened by small, finely dispersed particles of base metal oxide. The base metal is either 0.01-0.5 wt. % Sc or a mixture/ alloy of Sc and at least one metal from the group consisting of Zr, Y, and Ce with a total base metal content of 0.05-0.5 wt. %.Type: ApplicationFiled: September 4, 2001Publication date: May 16, 2002Applicant: W.C. Heraeus GmbH & Co.KGInventors: Harald Manhardt, David Francis Lupton, Wulf Kock
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Patent number: 6384533Abstract: The invention relates to a metal component for discharge lamps, having a support of niobium or tantalum or of alloys based on niobium and/or tantalum, as well as a discharge lamp. The present invention is addressed to the problem of increasing the resistance to oxidation and corrosion of metal components having a support of niobium or tantalum or of alloys based on niobium and/or tantalum which are disposed in or on discharge lamps. The problem is solved according to the invention in that the support has a coating of one or more single layers which is formed of at least one noble metal and/or from a noble metal alloy.Type: GrantFiled: February 17, 2000Date of Patent: May 7, 2002Assignee: W. C. Heraeus GmbH & Co. KGInventors: Thomas Giesel, David Francis Lupton, Frank Krüger, Friedhold Schölz
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Publication number: 20010045267Abstract: In the production of precision castings by centrifugal casting with controlled solidification, a melt is cast under vacuum or shield gas into a preheated mold (15) with a central gate (19) and several mold cavities proceeding from the gate toward the outer circumference (Da) of the mold (15). To prevent the formation of shrinkholes and porous areas in the castings, to save energy, and to increase the production rate, the mold (15) is operated at temperatures which decrease from the inside toward the outside. The mold consists of a material or material combination with a coefficient of thermal conductivity lower than that of copper. Before the melt is poured, the mold (15) is heated, starting from the gate (19), by a heating device (20), which projects into the gate, so that the gate (19) reaches a temperature which is a function of the material being cast. Heating is carried out at a rate sufficient to produce a temperature gradient of at least 100° C., preferably of 200-600° C.Type: ApplicationFiled: May 4, 2001Publication date: November 29, 2001Applicant: ALD Vacuum Technologies AGInventors: Alok Choudhury, Harald Scholz, Matthias Blum, Georg Jarczyk, Marek Gorywoda, David Francis Lupton
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Patent number: 6267801Abstract: A method for producing a tubular hydrogen permeation membrane comprising: (a) adhering at least one layer containing palladium, at least one palladium alloy, platinum, or at least one platinum alloy to a first surface of a plate having such first surface and a second surface disposed opposite to the first surface, the plate being of a metal or a metal alloy containing at least one metal from a group of the Periodic System of Elements selected from the group consisting of the fourth secondary group and the fifth secondary group, to form a layered plate; and (b) reshaping the layered plate into a tubular hydrogen permeation membrane having an inside wall, so that the layer adhered to the first surface is disposed on the inside wall of the tubular hydrogen permeation membrane.Type: GrantFiled: September 8, 1999Date of Patent: July 31, 2001Assignee: W. C. Heraeus GmbH & Co. KGInventors: Reinhard Baake, David Francis Lupton
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Patent number: 6250366Abstract: In the production of precision castings by centrifugal casting with controlled solidification, a melt is cast under vacuum or shield gas into a pre-heated mold (15) with a central gate (19) and several mold cavities proceeding from the gate toward the outer circumference (Da) of the mold (15). To prevent the formation of shrinkholes and porous areas in the castings, to save energy, and to increase the production rate, the mold (15) is operated at temperatures which decrease from the inside toward the outside. The mold consists of a material or material combination with a coefficient of thermal conductivity lower than that of copper. Before the melt is poured, the mold (15) is heated, starting from the gate (19), by a heating device (20), which projects into the gate, so that the gate (19) reaches a temperature which is a function of the material being cast. Heating is carried out at a rate sufficient to produce a temperature gradient of at least 100° C., preferably of 200-600° C.Type: GrantFiled: September 26, 1997Date of Patent: June 26, 2001Assignee: ALD Vacuum Technologies GmbHInventors: Alok Choudhury, Harald Scholz, Matthias Blum, Georg Jarczyk, Marek Gorywoda, David Francis Lupton
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Patent number: 6129997Abstract: A method is provided for manufacturing a welded shaped body of platinum material dispersion-hardened by finely divided small particles of base metal oxide, especially such a body provided with at least one inside wall, such as a tube. The base metal oxide is one or more oxides of the elements yttrium, zirconium and cerium. The method includes shaping and welding of at least one part, especially a sheet, of an alloy of platinum and base metal, to a preform body, e.g. a tube. The preform body is then subjected to heat treatment in an oxidizing medium until the minimum degree of oxidation of the base metal reaches 75 wt %. The preform body is then formed into the desired product.Type: GrantFiled: March 10, 1999Date of Patent: October 10, 2000Assignee: W. C. Heraeus GmbH & Co. KGInventors: Franz Braun, Wulf Kock, David Francis Lupton
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Patent number: 6089051Abstract: Fine-mesh warp-knit fabrics of noble metal-containing wires with high specific surface areas, having good mechanical stability, are produced by warp-knitting noble metal-containing wires to form closed stitches, such that the warp-knit fabric has at least 14 stitches per inch, and such that in at least one of the knit weaves forming the warp-knit fabric, the noble metal-containing wires are laid down over at least three stitch spacings.Type: GrantFiled: November 10, 1993Date of Patent: July 18, 2000Assignee: W.C. Heraeus GmbHInventors: Marek Gorywoda, Michael Hormann, Gunter Lindenmayer, David Francis Lupton, Bruno Streb
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Patent number: 6080341Abstract: A process for making an indium-tin-oxide shaped body, comprising: (a) filling an indium-tin-oxide powder into a first flexible mold, the indium-tin-oxide powder having a specific BET surface of at most 3 m.sup.2 /g with a mean primary particle size of 0.03 .mu.m to 1.0 .mu.m and/or having a density of at least 40% of theoretical density after cold pressing at a pressure of 100 MPa and/or the indium-tin-oxide powder being made by reacting at least two reaction partners comprising a molten indium-tin-metal alloy as a first reaction partner and oxygen as a second reaction partner in a plasma arc in a plasma chamber provided with an inlet opening for the reaction partners and an outlet with a gas-supply device to obtain a material, and quenching the material at the outlet opening of the plasma chamber with a gas stream which cools the material at a cooling rate of 10.sup.5 K/s to 10.sup.8 K/s to +50.degree. C. to +400.degree. C.Type: GrantFiled: May 12, 1999Date of Patent: June 27, 2000Assignee: W.C. Heraeus GmbH & Co. KGInventors: Bernd Stenger, Marek Gorywoda, David Francis Lupton, Wolfram Graf, Wolfgang Jablonski
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Patent number: 6039920Abstract: A process for making iron, cobalt and/or nickel base alloys containing rhenium. The process involves melting together the components that form the alloys, at least one of the components being a rhenium master alloy having 30 to 70 wt % rhenium, then casting the resultant melt and allowing the melt to solidify. Possible difficulties such as the formation of rhenium heptoxide are avoided by using a master alloy containing (i) rhenium and (ii) iron, cobalt and/or nickel, instead of sintered rhenium as the rhenium source during the melting step.Type: GrantFiled: May 4, 1998Date of Patent: March 21, 2000Assignee: W. C. Heraeus GmbH & Co. KGInventors: Michael Koch, Wulf Kock, David Francis Lupton, Friedhold Scholz
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Patent number: 6030507Abstract: A process for making a crystalline solid-solution powder which involves reacting at least two reactants in a plasma arc of a plasma chamber and blast-cooling the resultant product in a high velocity gas stream to form the powder. The first reactant is a molten metal alloy and the second reactant is a gas. The reaction is carried out in a plasma arc and the products rapidly cooled by a gas stream acting at the outlet opening of the plasma chamber. The crystalline solid-solution powder formed by the process has a low electrical resistivity. If an indium-tin alloy is used as the first reactant and oxygen as the second reactant, there is obtained an indium-tin-oxide (ITO) crystalline solid-solution powder which, when compacted to 40% of its theoretical density, has an electrical resistivity in the range of about 2 .OMEGA.cm. This ITO crystalline solid-solution powder is particularly suitable for preparing an ITO target, with high electrical conductivity and thus high achievable sputtering rates.Type: GrantFiled: May 14, 1998Date of Patent: February 29, 2000Assignee: W.C. Heraeus GmbH & Co. KGInventors: David Francis Lupton, Jorg Schielke, Marek Gorywoda, Bernard Serole, Friedhold Scholz
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Patent number: 5993545Abstract: A sintered rhenium crucible, highly suitable for growing single crystals from refractory metal oxides, for example by the Czochralski technique, is formed of fine rhenium powder, by sintering. A compact is formed by cold isostatic pressing and thereafter the compact is sintered at 500-2800.degree. C. to obtain a sintered crucible. Product density is limited to 88-95% of theroretical in order to maximize creep resistance.Type: GrantFiled: January 9, 1998Date of Patent: November 30, 1999Assignee: W.C. Heraeus GmbH & Co. KGInventors: David Francis Lupton, Jorg Schielke, Manfred Weigelt, Klaus Petermann, Eric Mix, Livio Fornasiero
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Patent number: 5796019Abstract: A method of manufacturing an electrically conductive cermet that includes less than 35% by volume of a precious metal by mixing a powdered refractory ceramic with the powdered metal, molding the mixture into a green, and sintering the green to create a cermet with a dense ceramic phase and a metallic phase in the form of a coherent network. The object is good electric conductivity at a low metal content. The precious metal powder is selected to shrink less and exhibits less sintering tendency as it forms the metallic phase than does the ceramic powder as it forms the ceramic phase.Type: GrantFiled: January 5, 1996Date of Patent: August 18, 1998Assignees: W.C. Heraeus GmbH, Friatec AGInventors: David Francis Lupton, Jorg Schielke, Hans-Joachim Graf, Arno Reckziegel
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Patent number: 5762768Abstract: The targets for cathodic sputtering according to this invention are formed of hot-pressed or hot isostatic-pressed indium oxide/tin oxide powder with a minimum density of 95% of the theoretical density and with a sub-stoichiometric oxygen content are known. In order to provide the improvement of high stability and, simultaneously, high sputtering rate, it is proposed according to the invention that the target have a crystalline phase which is formed as a solid solution of indium oxide and tin oxide with a minimum of 90% by weight, preferably a minimum of 97%, of the solid solution, and which has an average grain size ranging from 2 .mu.m to 20 .mu.m.Type: GrantFiled: August 8, 1996Date of Patent: June 9, 1998Assignee: W.C. Heraeus GmbHInventors: Karl-Heinz Goy, David Francis Lupton, Jorg Schielke, Friedhold Scholz, Bernard Serole, Hans Bohmeier
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Patent number: 5700418Abstract: A component made of sintered oxides of indium and tin and a method of manufacturing such a component. The mean size of the oxide particles is larger than 2 .mu.m. The empirical density of the component is more than 95% of theoretical. The component is characterized in that at least 97 weight % of the oxide particles are solid solution crystals with a crystalline matrix of indium oxide. The method comprises molding a green body of a powder of indium-oxide and tin-oxide solid solution and sintering the green body at a temperature less than 1100.degree. C. and preferably between 800.degree. and 1050.degree. C.Type: GrantFiled: July 19, 1995Date of Patent: December 23, 1997Assignee: W.C. Heraeus GmbHInventors: Michael Hormann, David Francis Lupton, Jorg Schielke, Friedhold Scholz
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Patent number: 3954509Abstract: A process for producing carbidic low expansion alloy which is especially useful as a cast structure requiring close dimensional tolerances is comprised of about 21 to about 55% nickel, up to about 18% cobalt, from about 0.3 to about 2.5% carbon, up to about 3% chromium, from about 0.2 to about 1.2% vanadium, up to about 3% molybdenum, up to about 2% zirconium, niobium and tungsten, and the balance essentially iron, with the provisos:% Ni + 0.75 (% Co) = 30.5 to 55,Cr + Mo + V + Zr + Nb + W = 1 to 4Ni : Fe .gtoreq. 0.4:1.Type: GrantFiled: August 11, 1975Date of Patent: May 4, 1976Assignee: The International Nickel Company, Inc.Inventors: David Francis Lupton, John Jefferson Mason, Peter John Penrice
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Patent number: 3940295Abstract: A carbidic low expansion alloy which is especially useful as a cast structure requiring close dimensional tolerances is comprised of about 21 to about 55% nickel, up to about 18% cobalt, from about 0.3 to about 2.5% carbon, up to about 3% chromium, from about 0.2 to about 1.2% vanadium, up to about 3% molybdenum, up to about 2% zirconium, niobium and tungsten, and the balance essentially iron, with the provisos:% Ni + 0.75 (% Co) = 30.5 to 55, Cr + Mo + V + Zr + Nb + W = 1 to 4 Ni : Fe .gtorsim. 0.4:1.Type: GrantFiled: October 25, 1974Date of Patent: February 24, 1976Assignee: The International Nickel Company, Inc.Inventors: David Francis Lupton, John Jefferson Mason, Peter John Penrice