Patents Assigned to H. C. Starck GmbH
  • PROCESS FOR PRODUCING PURE AMMONIUM PERRHENATE
    Publication number: 20110123709
    Abstract: A process for preparing a pure ammonium perrhenate includes producing a first aqueous suspension containing an ammonium perrhenate. A stoichiometric amount of a nitric acid is added to the first aqueous suspension so as to produce a second suspension. The second suspension is introduced into a cathode space of an electrolysis cell. The electrolysis cell is divided by a cation-exchange membrane into the cathode space and an anode space. The nitric acid is cathodically reduced to a nitrous acid in the cathode space by applying an electric potential. The nitrous acid is reacted with ammonium ions of the ammonium perrhenate so as to form an aqueous perrhenic acid. Potassium ions are removed from the aqueous perrhenic acid. At least a stoichiometric amount of ammonia is added to the aqueous perrhenic acid so as to produce the pure ammonium perrhenate.
    Type: Application
    Filed: April 29, 2009
    Publication date: May 26, 2011
    Applicant: H.C. Starck GMBH
    Inventors: Armin Olbrich, Matthias Jahn, Juliane Meese-Marktscheffel, Ruediger Zertani
  • REDUCTION METHOD
    Publication number: 20110116965
    Abstract: Processes comprising: melting a mixture comprising a valve metal precursor and a diluting agent in at least one first vessel under a first set of temperature and residence time conditions; transferring the mixture to at least one second vessel; and initiating, in the at least one second vessel, a reaction of the valve metal precursor to form a valve metal under a second set of temperature and residence time conditions; valve metal powder prepared thereby and uses therefor.
    Type: Application
    Filed: October 13, 2010
    Publication date: May 19, 2011
    Applicant: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Jürgen Hilpert
  • Transparent polymeric electrodes for electro-optical structures, processes for producing the same, and dispersions used in such processes
    Patent number: 7938986
    Abstract: The invention concerns a process for producing transparent multi-layer electrodes from conductive polymers, electrodes produced by this process and their use in electro-optical structures.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: May 10, 2011
    Assignee: H.C. Starck GmbH & Co. KG
    Inventors: Andreas Elschner, Peter Wilfried Loevenich, Friedrich Jonas
  • METHOD FOR SOLUBILIZING MOLYBDENUM OXIDE CONCENTRATES
    Publication number: 20110088513
    Abstract: A process for digesting molybdenum oxide concentrates includes suspending a molybdenum-containing starting material in an aqueous solution so as to obtain a suspension. While stirring, an oxidizing agent and an alkali solution of at least one alkali metal are metered to the suspension so as to set a pH and produce a product having a molybdenum content of at least 98% of the molybdenum-containing starting material. The alkali metal is selected from the group consisting of Na, K and Li.
    Type: Application
    Filed: November 4, 2008
    Publication date: April 21, 2011
    Applicant: H.C. STARCK GMBH
    Inventors: Brigitte Schimrosczyk, Gisbert Ebeling, Joerg Henze
  • Electroluminescent arrangements
    Patent number: 7923475
    Abstract: 3,4-Polyalkylenedioxythiophene dispersions comprising polyanions and cationic 3,4-polyalkylenedioxythiophenes, in particular those of the formula (I) in which n is an integer from 3 to 100, preferably from 4 to 15, and X is —(CH2)x—CR1R2—(CH2)y—, where R1 and R2, independently of one another, are H, an optionally substituted alkyl radical having from 1 to 20 carbon atoms, an aryl radical having from 6 to 14 carbon atoms or —CH2—OR3, where R3=H, alkyl or —CH2—CH2—CH2—SO3H, and x and y are each, independently of one another, an integer from 0 to 9, in which at least 90% of the particles are <50 nm, can be employed in electroluminescent arrangements having a long service life and high luminosity.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: April 12, 2011
    Assignee: H. C. Starck GmbH
    Inventors: Friedrich Jonas, Andreas Elschner, Klaus Wussow, Rolf Wehrmann
  • METHOD FOR PRODUCTION OF AMMONIUM PARATUNGSTATE TETRAHYDRATE AND HIGHLY PURE AMMONIUM PARATUNGSTATE TETRAHYDRATE
    Publication number: 20110070148
    Abstract: The invention is directed to a method for the production of ammonium paratungstate tetrahydrate by thermal treatment of ammonium paratungstate decahydrate in an aqueous suspension. The ammonium paratungstate tetrahydrate can be produced with high purity and high yield. The production method may furthermore be carried out in a simple and energy-efficient manner.
    Type: Application
    Filed: November 12, 2010
    Publication date: March 24, 2011
    Applicant: H.C. Starck GmbH
    Inventors: Viktor Stoller, Michael Erb, Juliane Meese-Marktscheffel, Michael Lohse, Wolfgang Mathy
  • METHOD FOR PRODUCTION OF NIOBIUM AND TANTALUM POWDER
    Publication number: 20110067527
    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: October 22, 2010
    Publication date: March 24, 2011
    Applicants: H. C. Starck GmbH, H. C. Starck Ltd.
    Inventors: Helmut HAAS, Ulrich BARTMANN, Tadashi KOMEYA, Nobuyuki SATO
  • Low-energy method for fabrication of large-area sputtering targets
    Patent number: 7910051
    Abstract: In various embodiments, large-area sputtering targets are formed by providing a plurality of sputtering targets each comprising a backing plate and a refractory metal layer disposed thereon, and spray depositing a refractory metal powder on an interface between the sputtering targets, the refractory metal powder consisting essentially of the same metal as each refractory metal layer, thereby joining the refractory metal layers of the sputtering targets.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: March 22, 2011
    Assignees: H.C. Starck GmbH, H.C. Starck, Inc.
    Inventors: Stefan Zimmermann, Steve A. Miller, Prabhat Kumar, Mark Gaydos
  • Method for producing solid electrolyte capacitors
    Patent number: 7897197
    Abstract: Disclosed are sintered bodies that include: (a) 30 to 100 mol % of NbOx, wherein 0.5<x<1.5; and (b) 0 to 70 mol % of MgO. The sintered bodies may be used as inert apparatuses in the production of niobium suboxide powder or niobium suboxide anodes, or as chemically resistant components in chemical apparatuses.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: March 1, 2011
    Assignee: H. C. Starck GmbH
    Inventors: Christoph Schnitter, Gerhard Wötting
  • Tantalum powder for the production of solid electrolyte capacitors
    Patent number: 7898794
    Abstract: A tantalum powder consisting of agglomerated primary particle with a minimum primary particle dimension of 0.2 to 0.8 ?m, a specific surface area of 0.9 to 2.5 m2/g and a particle size distribution determined to ASTM B 822 corresponding to a D10 value of 5 to 25 ?m, a D50 value of 20 to 140 ?m and a D90 value of 40 to 250 ?m, wherein the powder does not comprise an effective content of sintering protection agents.
    Type: Grant
    Filed: September 24, 2005
    Date of Patent: March 1, 2011
    Assignee: H. C. Starck GmbH
    Inventors: Helmut Haas, Ulrich Bartmann
  • ELECTROLYTE FOR COST-EFFECTIVE, ELECTROLYTE-SUPPORTED HIGH-TEMPERATURE FUEL CELL HAVING HIGH PERFORMANCE AND HIGH MECHANICAL STRENGTH
    Publication number: 20110027690
    Abstract: Electrolyte for an electrolyte-supported high-temperature fuel cell includes zirconium(IV) oxide doped with from 3.5 mol % to 6.5 mol % of ytterbium(III) oxide. The electrolyte has a thermal expansion coefficient (TEC) based on 30° C. of from 10.6*10?6 K?1 to 11.1*10?6 K?1 at 800° C.
    Type: Application
    Filed: January 20, 2009
    Publication date: February 3, 2011
    Applicant: H.C. STARCK GMBH
    Inventors: Ralph Otterstedt, Joerg Laube, Marianne Gottschling, Michael Svec
  • Anode-supported fuel cell
    Patent number: 7851104
    Abstract: Anode-supported fuel cell, in particular SOFC, where stresses in the anode substrate are compensated for by a stress compensation layer. According to the invention said stress compensation layer is made porous by making a large number of vary small openings. These openings are preferably made hexagonal and the thickness of the walls between the openings is minor. An electron-conducting porous layer is applied to the stress compensation layer.
    Type: Grant
    Filed: July 3, 2003
    Date of Patent: December 14, 2010
    Assignee: H. C. Starck GmbH
    Inventors: Pieter Nammensma, Robert De Rooy, Bartholomeus Cornelis Broersen
  • POWDER NiaMbOx(OH)y COMPOUNDS, PROCESSES FOR MAKING THE SAME, AND USES THEREOF IN BATTERIES
    Publication number: 20100310869
    Abstract: Powdery compounds of the formulation NiaMbOx(OH)y, a procedure to produce the same, and the use of the same as active material for nickel metal hydride batteries and/or as precursor for the production of lithium compounds for use in secondary lithium batteries.
    Type: Application
    Filed: September 2, 2008
    Publication date: December 9, 2010
    Applicant: H.C. Starck Gmbh
    Inventors: Matthias Jahn, Gerd Maikowski, Stefan Malcus, Juliane Meese-Marktscheffel, Armin Olbrich, Rüdiger Zertani
  • Capacitor powder
    Patent number: 7833511
    Abstract: Disclosed herein are capacitors having an anode based on niobium and a barrier layer based on niobium pentoxide, at least the barrier layer having a content of vanadium and process for their preparation and use.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: November 16, 2010
    Assignee: H.C. Starck GmbH
    Inventors: Karlheinz Reichert, Christoph Schnitter
  • Method for the production of niobium and tantalum powder
    Patent number: 7824463
    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 vapor 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: Grant
    Filed: April 9, 2005
    Date of Patent: November 2, 2010
    Assignees: H. C. Starck GmbH, H.C. Starck Ltd.
    Inventors: Helmut Haas, Ulrich Bartmann, Tadashi Komeya, Nobuyuki Sato
  • Drill bits comprising dual-phase tungsten carbide material
    Patent number: 7810587
    Abstract: The invention relates to a drill bit containing tungsten carbide powder having powder particles which have a core of cast tungsten carbide and a shell of tungsten monocarbide.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: October 12, 2010
    Assignee: H.C. Starck GmbH
    Inventors: Christian Gerk, Klause-Dieter Wernicke
  • TOOL
    Publication number: 20100239855
    Abstract: Coated metal cutting tools with reduced adhesion weat and improved thermal resistance, processes for making the same and methods of use.
    Type: Application
    Filed: May 26, 2008
    Publication date: September 23, 2010
    Applicant: H.C. Starck GmbH
    Inventors: Benno Gries, Leo Prakash
  • Process for the electrochemical decomposition of powders and electrolysis cells suitable therefor
    Patent number: 7799184
    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: Grant
    Filed: November 9, 2006
    Date of Patent: September 21, 2010
    Assignee: H.C. Starck GmbH
    Inventors: Armin Olbrich, Juliane Meese-Marktscheffel, Gerhard Gille, Viktor Stoller, Wolfgang Mathy
  • ZIRCONIUM OXIDE AND METHOD FOR THE PRODUCTION THEREOF
    Publication number: 20100233579
    Abstract: The invention relates to a pulverulent zirconium oxide containing metal oxides from the group consisting of scandium, yttrium, rare earths and mixtures thereof, processes for producing them and their use in fuel cells, in particular for the production of electrolyte substrates for ceramic fuel cells.
    Type: Application
    Filed: July 24, 2007
    Publication date: September 16, 2010
    Applicant: H.C. Starck GmbH
    Inventors: Jörg Laube, Alfred Gügel, Ralph Otterstedt
  • Polymer coatings having improved resistance to solvents
    Patent number: 7785493
    Abstract: The present invention relates to coatings comprising electrically conductive polymers and melamine derivatives, their preparation and use, and dispersions for the preparation of such coatings.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: August 31, 2010
    Assignee: H. C. Starck GmbH & Co. KG
    Inventors: Friedrich Jonas, Udo Guntermann