Patents Assigned to H.C. STARCK
  • Metalothermic reduction of refractory metal oxides
    Patent number: 7354472
    Abstract: A method of producing a refractory metal powder by (A) combining (i) an oxide particle component and (ii) a reducing agent; (B) forming a substantially uniform mixture of (i) and (ii); (C) continuously feeding the mixture into a furnace; (D) igniting the mixture at a reaction zone and starting a reaction that is sufficiently exothermic to form a high temperature flash; (E) starting a reaction that is sufficiently exothermic to form a high temperature self-sustaining flash; and (F) producing a free-flowing reduced oxide powder.
    Type: Grant
    Filed: June 21, 2004
    Date of Patent: April 8, 2008
    Assignee: H.C. Starck Inc.
    Inventors: Leonid Natan Shekhter, Edward V. McCormick, Leah F. Simkins, Edward K. Schiele
  • METHODS OF PREPARING SILICA SOLS, AND STABLE HIGH-SOLIDS SILICA SOLS PREPARED THEREBY
    Publication number: 20080076838
    Abstract: Methods comprising: (a) providing a silica sol having a BET surface area of 15 to 1000 m2/g and a solids content of up to 45% by weight of silicon dioxide, based on the silica sol; (b) mixing the silica sol and an anionic polyether carboxylate to form a mixture, wherein the anionic polyether carboxylate is mixed with the silica sol in an amount of 0.01 to 10% by weight, based on the mixture; and (c) concentrating the mixture to form a concentrated mixture having a solids content of 20 to 70% by weight of silicon dioxide, based on the concentrated mixture; and the concentrated sols prepared thereby.
    Type: Application
    Filed: September 21, 2007
    Publication date: March 27, 2008
    Applicant: H.C. Starck GmbH
    Inventor: Lothar Puppe
  • PROCESSES FOR PREPARING NIOBIUM ALKOXIDES, AND NIOBIUM ALKOXIDES PREPARED THEREBY
    Publication number: 20080071102
    Abstract: Processes for preparing high-purity niobium alkoxides, especially niobium ethoxide, are described which include: (a) providing a crude niobium alkoxide starting material comprising at least one compound of the general formula (I) Nb(OR)5 ??(I) wherein each R independently represents a linear or branched C1-12 alkyl group; and (b) contacting the crude niobium alkoxide starting material with a treatment medium comprising a component selected from the group consisting of (i) one or more alcohols of the general formula (II) in an amount of 0.01 to 5% by weight, (ii) air or an oxygen-containing gas, and (iii) combinations thereof; R1OH ??(II) wherein each R1 independently represents a linear or branched C1-12 alkyl group.
    Type: Application
    Filed: September 14, 2007
    Publication date: March 20, 2008
    Applicant: H. C. Starck GmbH
    Inventor: Knud Reuter
  • PROCESS FOR PRODUCING SILICATIC MOLDINGS
    Publication number: 20080061475
    Abstract: The invention relates to a process for producing a molding, characterized in that a silicatic solid is mixed with a solution comprising a first silicatic binder and the mixture is then press-molded, and the compression molding is then post-treated with a solution comprising a second silicatic binder, and to silicatic moldings obtainable by this process, and also to their use as construction material, insulator material, gasket material or fire-resistant material.
    Type: Application
    Filed: November 16, 2007
    Publication date: March 13, 2008
    Applicant: H. C. Starck GmbH
    Inventors: Dietrich Pantke, Peter-Nikolaus Schmitz, Hartmut Melzer
  • Polythiophenes having alkyleneoxythia thiophene units in electrolyte capacitors
    Patent number: 7341801
    Abstract: Electrolyte capacitors containing certain polythiophenes are described. More particularly, the polythiophenes have backbones containing repeating units of the following general formula (I) and/or repeating units of the following general formula (II), wherein A is, for example, a C1-C5-alkylene radical, R is, for example, a C1-C18-alkyl radical, and x is an integer from 0 to 8. Also described are dispersions comprising such polythiophenes, and the use of such polythiophenes or dispersions thereof for producing conductive layers.
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: March 11, 2008
    Assignee: H.C. Starck GmbH
    Inventors: Knud Reuter, Udo Merker, Friedrich Jonas
  • Process for producing niobium suboxide
    Patent number: 7341705
    Abstract: A method is described for preparing a niobium suboxide represented by the formula, NbOx, in which 0.7<x<1.3. The method involves reacting NbOy (in which y<1.8<2.1) with a stoichiometric amount of niobium metal, in the presence of hydrogen. The niobium suboxide produced by such method may be used to fabricate anodes for solid electrolyte capacitors.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: March 11, 2008
    Assignee: H.C. Starck GmbH
    Inventor: Christoph Schnitter
  • TANTALUM AND NIOBIUM COMPOUNDS AND THEIR USE FOR CHEMICAL VAPOUR DEPOSITION (CVD)
    Publication number: 20080038466
    Abstract: The present invention relates to special, novel tantalum and niobium compounds, the use thereof for the deposition of tantalum- or niobium-containing layers by means of chemical vapour deposition and the tantalum- or niobium-containing layers produced by this process.
    Type: Application
    Filed: August 9, 2007
    Publication date: February 14, 2008
    Applicant: H. C. Starck GmbH
    Inventors: Knud Reuter, Stephan Kirchmeyer, Daniel Gaess, Michael Pokoj, Jorg Sundermeyer, Wolfgang Stolz, Thomas Ochs, Kerstin Volz
  • Deoxidation of Valve Metal Powders
    Publication number: 20080011124
    Abstract: Deoxidation of valve metal powders, in particular of niobium powders, tantalum powders or their alloys, by treating the valve metal powder with calcium, barium, lanthanum, yttrium or cerium as deoxidising agent, and valve metal powders that are distinguished by a ratio of the sum of the contents of sodium, potassium and magnesium to the capacitance of less than 3 ppm/10,000 ?FV/g.
    Type: Application
    Filed: August 26, 2002
    Publication date: January 17, 2008
    Applicant: H.C. Starck GmbH & Co. KG
    Inventors: Josua Loffelholz, Ulrich Bartmann
  • Process for the production of electrolyte capacitors
    Publication number: 20080005878
    Abstract: The invention relates to a process for the production of electrolyte capacitors having a low equivalent series resistance and low residual current, electrolyte capacitors produced by this process and the use of such electrolyte capacitors.
    Type: Application
    Filed: September 13, 2006
    Publication date: January 10, 2008
    Applicant: H. C. STARCK
    Inventors: Udo Merker, Wilfried Lovenich, Klaus Wussow, Ralf Tillmann
  • AQUEOUS DISPERSIONS OF POLYVINYLACETATE AND SILICA, PROCESSES FOR PREPARING THE SAME, USES THEREFOR AND SUBSTRATES COATED AND/OR BONDED THEREWITH
    Publication number: 20070292683
    Abstract: Aqueous polymeric dispersions comprising a mixture of: (a) a component selected from the group consisting of polyvinylacetates, polyvinylacetate copolymers, and combinations thereof; and (b) SiO2 particles having an average particle diameter of 1 to 400 nm; their use as adhesives and coatings; processes for preparing such dispersions; and substrates coated and/or adhered therewith.
    Type: Application
    Filed: May 10, 2007
    Publication date: December 20, 2007
    Applicant: H.C. Starck GmbH & Co. KG
    Inventors: Dietrich Pantke, Stephan Kirchmeyer, Rudiger Musch, Knud Panskus
  • PROCESS FOR SEPARATING ZIRCONIUM AND HAFNIUM
    Publication number: 20070283536
    Abstract: The present invention provides a new process for separating zirconium and hafnium compounds, in particular to remove traces of zirconium compounds from hafnium compounds, using fractional crystallisation, as well as hafnium compounds obtainable in accordance with this process.
    Type: Application
    Filed: May 2, 2007
    Publication date: December 13, 2007
    Applicant: H. C. Starck GmbH & Co., KG
    Inventors: Knud Reuter, Gerd Passing, Stephan Kirchmeyer
  • Process for producing silicatic moldings
    Patent number: 7297309
    Abstract: The invention relates to a process for producing a molding, characterized in that a silicatic solid is mixed with a solution comprising a first silicatic binder and the mixture is then press-molded, and the compression molding is then post-treated with a solution comprising a second silicatic binder, and to silicatic moldings obtainable by this process, and also to their use as construction material, insulator material, gasket material or fire-resistant material.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: November 20, 2007
    Assignee: H.C. Starck GmbH
    Inventors: Dietrich Pantke, Peter-Nikolaus Schmitz, Hartmut Melzer
  • METHODS OF STABILIZING THIOPHENE DERIVATIVES
    Publication number: 20070260070
    Abstract: Methods of stabilizing thiophene derivatives of the general formula (I) by treatment with basic compounds: wherein R1 and R2 each independently represents a moiety selected from the group consisting of hydrogen, optionally substituted C1-20 alkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, optionally substituted C1-20 oxyalkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, or wherein R1 and R2 together represent a fused cyclic moiety selected from the group consisting of optionally substituted C1-20 dioxyalkylene groups and C1-20 dioxyarylene groups; and stabilized thiophene derivatives that can be prepared by such methods.
    Type: Application
    Filed: May 4, 2007
    Publication date: November 8, 2007
    Applicant: H. C. Starck GmbH & Co. KG
    Inventors: Friedrich Jonas, Klaus Wussow, Knud Reuter
  • PROCESS FOR THE ELECTROCHEMICAL DECOMPOSITION OF POWDERS AND ELECTROLYSIS CELLS SUITABLE THEREFOR
    Publication number: 20070256931
    Abstract: Process for the electrochemical decomposition of precursors in powder form by introducing a powder batch between two electrodes of an electrolysis cell, electrodes being designed to be liquid-permeable, and the electrolyte flowing through the powder batch perpendicularly to the electrode surfaces, and electrolysis cell suitable therefor, which is essentially characterized in that at least one electrode has a structure which consists of a supporting pierced plate (5), an electrode plate (3) provided with perforations, and a filter cloth (4) arranged between the supporting pierced plate (5) and the electrode plate (3), and in that the cathode (6) is shielded from the cell by means of a liquid-permeable separator (7).
    Type: Application
    Filed: November 9, 2006
    Publication date: November 8, 2007
    Applicant: H. C. Starck GmbH
    Inventors: Armin Olbrich, Juliane Meese-Marktscheffel, Gerhard Gille, Viktor Stoller, Wolfgang Mathy
  • Method for Dispersing and Passivating Particulate Powders in Water and Aqueous Media
    Publication number: 20070259970
    Abstract: The invention relates to a method for dispersing and passivating particulate powders in water and aqueous media. It is particularly advantageously applicable in the handling and processing of non-oxidic powders, e.g., in the ceramic and hard-metal industry. In the method claimed auxiliaries are added due to the process. According to the invention this method is characterized in that polyvinylamines and/or the initial products thereof are used as these auxiliaries.
    Type: Application
    Filed: April 13, 2005
    Publication date: November 8, 2007
    Applicants: FRAUNHOFER-GESELLSCHAFT ZUR FOEDERUNG DER ANGEWAND TEN FORSCHUNG E .V., G.U.S. BETEILIGUNGS GMBH, WOLFRAM BERGBAU – UND HUETTEN-GMBH NFG. KG, H.C. STARCK GMBH, KENNAMETAL GMBH & CO. KG, WERKZEUGE + HARTSTOFFE, KENNAMETAL WIDIA GMBH & CO. KG, GUEHRING OHG, HARTMETALL AG, CERATIZIT S.A.
    Inventors: Gottfried Boden, Sven Thiele, Manfred Nebelung
  • Process for preparing linear organic oligomers
    Patent number: 7288663
    Abstract: The present invention relates to a process for preparing compounds of the formula (I), where n is an integer from 2 to 5, R1 is H or a C1-C20-alkyl group which may be interrupted by one or more O or S atoms, silylene, phosphonoyl or phosphoryl groups and Ar is substituted or unsubstituted 1,4-phenylene, 2,7-fluorene or 2,5-thiophene, with Ar being able to be identical or different, semiconductive layers comprising these compounds and their use in semiconductor technology.
    Type: Grant
    Filed: October 16, 2003
    Date of Patent: October 30, 2007
    Assignee: H.C. Starck GmbH
    Inventors: Stephen Kirchmeyer, Sergei Ponomarenko
  • Process for the producing of electrolytic capacitors
    Patent number: 7279015
    Abstract: Process for the production of electrolytic capacitors with low equivalent series resistance and low residual current, having a solid electrolyte formed from conducting polymers and an outer layer containing conducting polymers and a binder, electrolytic capacitors produced by the process and their use.
    Type: Grant
    Filed: April 15, 2005
    Date of Patent: October 9, 2007
    Assignee: H.C. Starck GmbH
    Inventor: Udo Merker
  • Particular Calixarenes Method for Production and Use Thereof
    Publication number: 20070232826
    Abstract: The present invention relates to calix[4]arenes which effectively bind alkali metal ions (Na+, K+) and transport them over phase boundaries, their preparation and use.
    Type: Application
    Filed: August 16, 2005
    Publication date: October 4, 2007
    Applicants: BAYER TECHNOLOGY SERVICES GMBH, H.C. STARCK GMBH
    Inventors: Michael Traving, Wilfried Gutknecht, Werner Backer, Wolfgang Kummer, Rainer Ludwig
  • Method for the Production of Niobium and Tantalum Powder
    Publication number: 20070227305
    Abstract: Process for the production of valve metal powders, in particular niobium and tantalum powder, by reduction of corresponding valve metal oxide powders by means of vaporous reducing metals and/or hydrides thereof, preferably in the presence of an inert carrier gas, wherein the reduction is performed at a vapour partial pressure of the reducing metal/metal hydride of 5 to 110 hPa and an overall pressure of less than 1000 hPa, and tantalum powder obtainable in this way having a high stability of the powder agglomerate particles.
    Type: Application
    Filed: April 9, 2005
    Publication date: October 4, 2007
    Applicants: H. C. Starck GmbH & Co. KG, H. C. Starck Ltd.
    Inventors: Helmut Haas, Ulrich Bartmann, Tadashi Komeya, Nobuyuki Sato
  • Tungstic Acid Powder Consisting of Spherical Tungsten Particles and Method for Producing Same
    Publication number: 20070224096
    Abstract: Process for the production of a powdered spherical tungstic acid by acidification of an aqueous alkaline tungstate solution with mineral acid at elevated temperature, preferably in a continuous stirred tank or a cascade of at least 2 continuous stirred tanks, and tungstic acid obtainable in this way, which is characterised by a high bulk density and spherical morphology.
    Type: Application
    Filed: April 28, 2005
    Publication date: September 27, 2007
    Applicant: H.C. Starck GmbH & Co. KG
    Inventors: Sven Albrecht, Armin Olbrich, Michael Reib, Frank Schrumpf, Juliane Meese-Marktscheffel, Uwe Kutzler