Patents by Inventor Josua Löffelholz

Josua Löffelholz 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).

  • Niobium powders having a particle shape
    Patent number: 9543075
    Abstract: A valve metal powder having a particle shape factor mean value f, as determined by SEM image analysis, of 0.65?f?1, said powder has an average agglomerate particle size D50 value, as determined with a MasterSizer in accordance with ASTM B 822, of 40 to 200 ?m and wherein the valve metal powder is niobium.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: January 10, 2017
    Assignee: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Jürgen Hilpert
  • Processes for preparing valve metal powders, powders prepared thereby and uses therefor
    Patent number: 9030799
    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: Grant
    Filed: October 13, 2010
    Date of Patent: May 12, 2015
    Assignee: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Jürgen Hilpert
  • Production of valve metal powders
    Patent number: 8951328
    Abstract: The invention relates to the production of valve metal powders, in particular, tantalum powders by reduction of a corresponding valve metal compound, for example, K2TaF7, with an alkali metal in the presence of a diluent salt, whereby the reduction is carried out in the presence of a particle diminution agent, preferably, Na2SO4, which is added to the reaction mixture continuously or in aliquots.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: February 10, 2015
    Assignee: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Frank Behrens, Siegfried Schmieder
  • NIOBIUM POWDERS HAVING A PARTICLE SHAPE
    Publication number: 20140302338
    Abstract: A valve metal powder having a particle shape factor mean value f, as determined by SEM image analysis, of 0.65?f?1, said powder has an average agglomerate particle size D50 value, as determined with a MasterSizer in accordance with ASTM B 822, of 40 to 200 ?m and wherein the valve metal powder is niobium.
    Type: Application
    Filed: April 3, 2014
    Publication date: October 9, 2014
    Applicant: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Jürgen Hilpert
  • Processes for preparing valve metal powders, powders prepared thereby and uses therefor
    Patent number: 8623112
    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: Grant
    Filed: September 7, 2006
    Date of Patent: January 7, 2014
    Assignee: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Jürgen Hilpert
  • 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
  • Valve metal powders
    Patent number: 7485257
    Abstract: A valve metal powder by is prepared by a particular set of sequential steps that involves the use of precursor having preformed morphology. The method by which the valve metal is prepared includes a stabilization step that results in the valve metal powder having secondary and tertiary structures that each corresponds to the secondary and tertiary structures of the precursor. Also described is a method of producing solid electrolyte capacitors that include the valve metal powder of the present invention.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: February 3, 2009
    Assignee: H.C. Starck GmbH
    Inventors: Josua Löffelholz, Hady Seyeda, Rüdiger Wolf, Karlheinz Reichert, Christoph Schnitter
  • Process for the production of shaped articles of niobium or tantalum by electrochemical etching
    Patent number: 7090763
    Abstract: Process for the production of shaped articles of niobium or tantalum by electrochemical etching of a niobium or tantalum sheet covered by a structured photoresist mask in an aqueous solution containing hydrofluoric acid, the etching being effected under electrochemical conditions under which strong noise is superposed on the etching current and the etching solution contains a water-soluble polymer.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: August 15, 2006
    Assignee: H. C. Starck GmbH
    Inventors: Marianne Gottschling, Josua Löffelholz, Mathias Albert, Günter Sadowski
  • Valve metal powders and process for producing them
    Patent number: 7066979
    Abstract: Process for producing a valve metal powder by producing a precursor of desired morphology, converting the precursor into an oxide of the valve metal, stabilizing the structure of the oxide by heat treatment and reducing the stabilized oxide while retaining the morphology. Valve metal powders obtainable in this way, in particular comprising spherical agglomerates with a mean agglomerate size of 10–80 ?m, preferably 20–40 ?m, and use of these valve metal powders to produce solid electrolyte capacitors.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: June 27, 2006
    Assignee: H. C. Starck GmbH
    Inventors: Josua Löffelholz, Hady Seyeda, Rüdiger Wolf, Karlheinz Reichert, Christoph Schnitter
  • Valve metal powders and process for producing them
    Publication number: 20030230167
    Abstract: Process for producing a valve metal powder by producing a precursor of desired morphology, converting the precursor into an oxide of the valve metal, stabilizing the structure of the oxide by heat treatment and reducing the stabilized oxide while retaining the morphology. Valve metal powders obtainable in this way, in particular comprising spherical agglomerates with a mean agglomerate size of 10-80 &mgr;m, preferably 20-40 &mgr;m, and use of these valve metal powders to produce solid electrolyte capacitors.
    Type: Application
    Filed: March 7, 2003
    Publication date: December 18, 2003
    Inventors: Josua Loeffelholz, Hady Seyeda, Rudiger Wolf, Karlheinz Reichert, Christoph Schnitter
  • Paste for producing sintered refractory metal layers, notably earth acid metal electrolytic capacitors or anodes
    Patent number: 6510044
    Abstract: A paste is described for the production of sintered refractory metal layers, particularly for electrolytic capacitor anodes, consisting of 40 to 92% by weight of a refractory metal powder as a discrete phase, and of a continuous phase which substantially consists of organic compounds which are synthesised from carbon, oxygen and hydrogen only, wherein the ratio of the number of oxygen atoms to carbon atoms is at least 0.5, and optionally consisting of a solvent which evaporates below 150° C.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: January 21, 2003
    Assignee: H. C. Starck GmbH & Co. KG
    Inventors: Josua Löffelholz, Marianne Gottschling, Karsten Binner
  • Tantalum powder, method for producing same powder and sintered anodes obtained from it
    Patent number: 6238456
    Abstract: The present invention discloses a tantalum powder for capacitors and a method for making said tantalum powder wherein agglomerated tantalum powder is produced by means of thermal agglomeration of starting tantalum powders in the presence of hydrogen.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: May 29, 2001
    Assignee: H. C. Starck GmbH & Co. KG
    Inventors: Rüdiger Wolf, Karlheinz Reichert, Heike Biermann, Josua Löffelholz, Detlef Breithaupt