Patents by Inventor Harald Alff
Harald Alff 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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Publication number: 20230357012Abstract: The invention relates to a process for producing lithium zirconium phosphate by means of flame spray pyrolysis using as precursors lithium and zirconium carboxylates containing 5 to 20 carbon atoms, an organic phosphate, and a solvent containing less than 10% by weight water. Lithium zirconium phosphate obtainable by this process can be used in lithium ion batteries.Type: ApplicationFiled: March 19, 2021Publication date: November 9, 2023Applicant: EVONIK OPERATIONS GMBHInventors: Ryo TAKATA, Armin WIEGAND, Harald ALFF, Franz SCHMIDT, Daniel ESKEN, Marcel HERZOG
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Publication number: 20220336841Abstract: A process may produce mixed oxides including lithium, zirconium, and optionally at least one other than Li and Zr metal, by flame spray pyrolysis. Mixed oxides are obtainable by such a process. Such mixed oxides may be used in lithium ion batteries.Type: ApplicationFiled: September 10, 2020Publication date: October 20, 2022Applicant: Evonik Operations GmbHInventors: Durdu SCHÄFER, Armin WIEGAND, Harald ALFF, Ryo TAKATA, Franz SCHMIDT
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Publication number: 20220306485Abstract: The invention relates to a process for producing lithium zirconium mixed oxides by means of flame spray pyrolysis, mixed oxides obtainable by this process and their use in lithium ion batteries.Type: ApplicationFiled: September 10, 2020Publication date: September 29, 2022Applicant: Evonik Operations GmbHInventors: Durdu SCHÄFER, Armin WIEGAND, Harald ALFF, Ryo TAKATA, Franz SCHMIDT
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Patent number: 11434146Abstract: A process for producing a metal oxide powder by flame spray pyrolysis where a) a stream of a solution containing at least one oxidizable or hydrolysable metal compound is atomized to afford an aerosol by means of an atomizer gas, b) this aerosol is brought to reaction in the reaction space of the reactor with a flame obtained by ignition of a mixture of fuel gas and air, c) the reaction stream is cooled and d) the solid product is subsequently removed from the reaction stream, wherein e) the reaction space comprises one or more successive double-walled internals, wherein the wall of the double-walled internal facing the flame-conducting region of the reaction space comprises at least one slot through which a gas or vapour is introduced into the reaction space in which the flame is burning and f) the slot is arranged such that this gas or vapour brings about a rotation of the flame.Type: GrantFiled: December 20, 2017Date of Patent: September 6, 2022Assignee: Evonik Operations GmbHInventors: Peter Kress, Stipan Katusic, Armin Wiegand, Harald Alff, Michael Hagemann
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Publication number: 20200230703Abstract: Process for producing a tungsten oxide powder or a tungsten mixed oxide powder of general formula MxWO3, wherein M=Na, K, Rb, Li and/or Cs, 0.1?x?0.5, comprising the consecutive steps of: a) providing a solution comprising respectively at least one tungsten compound and optionally at least one M-comprising compound in a concentration corresponding to the stoichiometry MxWO3, b) atomizing the solution, thus forming an aerosol, into a reaction space, c) reacting the aerosol in the reaction space with a hydrogen/oxygen flame for which the expression 1<O2,primary/0.5H2?3 applies, wherein the reaction space is configured such that it comprises two reaction zones with two different velocities of the reaction mixture v1 and v2 where v2=0.3-0.8 v1 and 0.5?v1?10 Nm/s, d) separating the solid from vaporous or gaseous substances and e) passing a reducing gas stream over the separated solid at a temperature of 450-700° C.Type: ApplicationFiled: January 23, 2017Publication date: July 23, 2020Applicant: Evonik Degussa GmbHInventors: Stipan KATUSIC, Peter KRESS, Harald ALFF, Armin WIEGAND, Michael HAGEMANN
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Publication number: 20190352189Abstract: A process for producing a metal oxide powder by flame spray pyrolysis where a) a stream of a solution containing at least one oxidizable or hydrolysable metal compound is atomized to afford an aerosol by means of an atomizer gas, b) this aerosol is brought to reaction in the reaction space of the reactor with a flame obtained by ignition of a mixture of fuel gas and air, c) the reaction stream is cooled and d) the solid product is subsequently removed from the reaction stream, wherein e) the reaction space comprises one or more successive double-walled internals, wherein the wall of the double-walled internal facing the flame-conducting region of the reaction space comprises at least one slot through which a gas or vapour is introduced into the reaction space in which the flame is burning and f) the slot is arranged such that this gas or vapour brings about a rotation of the flame.Type: ApplicationFiled: December 20, 2017Publication date: November 21, 2019Applicant: EVONIK DEGUSSA GMBHInventors: Peter KRESS, Stipan KATUSIC, Armin WIEGAND, Harald ALFF, Michael HAGEMANN
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Patent number: 10384940Abstract: Process for producing metal oxide powders by means of flame spray pyrolysis, in which an aerosol comprising a metal compound is introduced into a flame in a reactor and reacted therein, and the metal oxide powder obtained is separated from gaseous substances, wherein a) the flame is formed by the ignition of an oxygen-containing gas (1) with a fuel gas, b) the aerosol is obtained by joint atomization of a solution containing a metal compound and an atomization gas by means of one or more nozzles and c) the ratio of the spray area to the cross-sectional reactor area is at least 0.2.Type: GrantFiled: June 28, 2016Date of Patent: August 20, 2019Assignee: Evonik Degussa GmbHInventors: Stipan Katusic, Peter Kress, Harald Alff, Tobias Renger, Armin Wiegand
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Patent number: 10204723Abstract: Core-shell particles containing crystalline iron oxide in the core and amorphous silicon dioxide in the shell and in which a) the shell contains from 5 to 40% by weight of silicon dioxide, b) the core contains b1) from 60 to 95% by weight of iron oxide and b2) from 0.5 to 5% by weight of at least one doping component selected from the group consisting of aluminum, calcium, copper, magnesium, silver, titanium, yttrium, zinc, tin and zirconium, c) where the % by weight indicated are based on the core-shell particles and the sum of a) and b) is at least 98% by weight of the core-shell particles, d) the core has lattice plane spacings of 0.20 nm, 0.25 nm and 0.29 nm, in each case+/?0.02 nm, determined by means of HR-TEM.Type: GrantFiled: July 17, 2013Date of Patent: February 12, 2019Assignee: EVONIK DEGUSSA GmbHInventors: Stipan Katusic, Harald Alff, Peter Albers, Harald Herzog, Peter Kress
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Publication number: 20180194627Abstract: Process for producing metal oxide powders by means of flame spray pyrolysis, in which an aerosol comprising a metal compound is introduced into a flame in a reactor and reacted therein, and the metal oxide powder obtained is separated from gaseous substances, wherein a) the flame is formed by the ignition of an oxygen-containing gas (1) with a fuel gas, b) the aerosol is obtained by joint atomization of a solution containing a metal compound and an atomization gas by means of one or more nozzles and c) the ratio of the spray area to the cross-sectional reactor area is at least 0.2.Type: ApplicationFiled: June 28, 2016Publication date: July 12, 2018Applicant: Evonik Degussa GmbHInventors: Stipan KATUSIC, Peter KRESS, Harald ALFF, Tobias RENGER, Armin WIEGAND
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Publication number: 20170275166Abstract: A process for producing a metal oxide powder proceeds by spray pyrolysis, in which a mixture comprising ammonia and an aerosol which is obtained by atomizing a solution containing a metal compound by means of an atomization gas is introduced into a high-temperature zone of a reaction space and reacted in an oxygen-containing atmosphere therein and the solids are subsequently separated off.Type: ApplicationFiled: November 12, 2015Publication date: September 28, 2017Applicant: Evonik Degussa GmbHInventors: Stipan KATUSIC, Peter KRESS, Harald ALFF, Armin WIEGAND
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Publication number: 20150213927Abstract: Core-shell particles containing crystalline iron oxide in the core and amorphous silicon dioxide in the shell and in which a) the shell contains from 5 to 40% by weight of silicon dioxide, b) the core contains b1) from 60 to 95% by weight of iron oxide and b2) from 0.5 to 5% by weight of at least one doping component selected from the group consisting of aluminium, calcium, copper, magnesium, silver, titanium, yttrium, zinc, tin and zirconium, c) where the % by weight indicated are based on the core-shell particles and the sum of a) and b) is at least 98% by weight of the core-shell particles, d) the core has lattice plane spacings of 0.20 nm, 0.25 nm and 0.29 nm, in each case +/?0.02 nm, determined by means of HR-TEM.Type: ApplicationFiled: July 17, 2013Publication date: July 30, 2015Applicant: Evonik Industries AGInventors: Stipan Katusic, Harald Alff, Peter Albers, Harald Herzog, Peter Kress
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Patent number: 8535633Abstract: Process for the production of doped metal oxide particles, wherein the doping component is present on the surface in the form of domains, wherein in a first reaction zone, an oxidizable and/or —hydrolysable metal compound as dopant together with an atomization gas is atomized into a flow of metal oxide particles in a carrier gas, wherein the mass flow of the metal oxide particles und —the mass flow of the dopant are selected such that the doped metal oxide particles contain 10 ppm to 10 wt.Type: GrantFiled: October 10, 2006Date of Patent: September 17, 2013Assignee: Evonik Degussa GmbHInventors: Kai Schumacher, Rainer Golchert, Helmut Roth, Harald Alff, Matthias Rochnia
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Patent number: 8197791Abstract: Aluminum oxide powder in the form of aggregates of primary-particles, which has a BET surface area of from 10 to 90 m2/g and comprises as crystalline phases, in addition to gamma-aluminum oxide and/or theta-aluminum oxide, at least 30% of delta-aluminum oxide. It is prepared by vaporizing aluminum chloride and burning the vapor together with hydrogen and air, the ratio of primary air/secondary air being 0.01 to 2, the exit speed vB of the reaction mixture from the burner being at least 10 m/s, the lambda value being 1 to 4, the gamma value being 1 to 3 and the value of gamma*vB/lambda being greater than or equal to 55. Dispersion comprising the aluminum oxide powder. Coating composition comprising the dispersion.Type: GrantFiled: December 20, 2005Date of Patent: June 12, 2012Assignee: Evonik Degussa GmbHInventors: Kai Schumacher, Martin Moerters, Juergen Flesch, Marcus Von Twistern, Volker Hamm, Matthias Schmitt, Harald Alff, Roland Schilling
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Patent number: 7658907Abstract: Titanium-aluminium mixed oxide powder with a proportion of aluminium oxide of less than 1 wt. % or a proportion of titanium dioxide of less than 5 wt. %, wherein the sum of the proportions of titanium dioxide and aluminium oxide is at least 99.7 wt. %. It is produced by transferring a vaporous starting compound of the quantitatively greater component of the mixed oxide into a mixing chamber by means of primary air and a vaporous starting compound of the quantitatively smaller component of the mixed oxide by means of an inert gas, and burning the mixture mixed with hydrogen in a mixing chamber into a reaction chamber. It can be used as a catalyst support.Type: GrantFiled: December 20, 2005Date of Patent: February 9, 2010Assignee: Degussa GmbHInventors: Kai Schumacher, Roland Schilling, Harald Alff, Helmut Roth
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Publication number: 20090272937Abstract: Aluminium oxide powder in the form of aggregates of primary- particles, which has a BET surface area of from 10 to 90 m2/g and comprises as crystalline phases, in addition to gamma- aluminium oxide and/or theta-aluminium oxide, at least 30% of delta-aluminium oxide. It is prepared by vaporizing aluminium chloride and burning the vapour together with hydrogen and air, the ratio of primary air/secondary air being 0.01 to 2, the exit speed vB of the reaction mixture from the burner being at least 10 m/s, the lambda value being 1 to 4, the gamma value being 1 to 3 and the value of gamma * vB/lambda being greater than or equal to 55. Dispersion comprising the aluminium oxide powder. Coating composition comprising the dispersion.Type: ApplicationFiled: December 20, 2005Publication date: November 5, 2009Applicant: DEGUSSA GmbHInventors: Kai Schumacher, Martin Moerters, Juergen Flesch, Marcus Von Twistern, Volker Hamm, Matthias Schmitt, Harald Alff, Roland Schilling
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Publication number: 20080311291Abstract: Process for the production of doped metal oxide particles, wherein the doping component is present on the surface in the form of domains, wherein in a first reaction zone, an oxidizable and/or - hydrolysable metal compound as dopant together with an atomization gas is atomised into a flow of metal oxide particles in a carrier gas, wherein the mass flow of the metal oxide particles und - the mass flow of the dopant are selected such that the doped metal oxide particles contain 10 ppm to 10 wt.Type: ApplicationFiled: October 10, 2006Publication date: December 18, 2008Applicant: EVONIK DEGUSSA GmbhInventors: Kai Schumacher, Rainer Golchert, Helmut Roth, Harald Alff, Matthias Rochnia
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Publication number: 20080096755Abstract: Titanium-aluminium mixed oxide powder with a proportion of aluminium oxide of less than 1 wt. % or a proportion of titanium dioxide of less than 5 wt. %, wherein the sum of the proportions of titanium dioxide and aluminium oxide is at least 99.7 wt. %. It is produced by transferring a vaporous starting compound of the quantitatively greater component of the mixed oxide into a mixing chamber by means of primary air and a vaporous starting compound of the quantitatively smaller component of the mixed oxide by means of an inert gas, and burning the mixture mixed with hydrogen in a mixing chamber into a reaction chamber. It can be used as a catalyst support.Type: ApplicationFiled: December 20, 2005Publication date: April 24, 2008Applicant: DEGUSSA GmbHInventors: Kai Schumacher, Roland Schilling, Harald Alff, Helmut Roth
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Patent number: 6773814Abstract: Metal oxide particles having a metal oxide core and a silicon dioxide coating have a low structure. The particle are produced by a base dissolved in water being added under agitation to a dispersion comprising a metal oxide, at least one compound of the type XnSi(OR)4−n, and water, the reaction product being separated out, optionally washed with water and dried. The metal oxide particles coated with silicon dioxide may be used in sun screening agents and in chemical-mechanical-polishing (CMP) applications.Type: GrantFiled: August 7, 2002Date of Patent: August 10, 2004Assignee: Degussa AGInventors: Kai Schumacher, Helmut Mangold, Steffen Hasenzahl, Harald Alff
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Publication number: 20030104198Abstract: Metal oxide particles having a metal oxide core and a silicon dioxide coating have a low structure. The particle are produced by a base dissolved in water being added under agitation to a dispersion comprising a metal oxide, at least one compound of the type XnSi(OR)4−n, and water, the reaction product being separated out, optionally washed with water and dried. The metal oxide particles coated with silicon dioxide may be used in sun screening agents and in chemical-mechanical-polishing (CMP) applications.Type: ApplicationFiled: August 7, 2002Publication date: June 5, 2003Applicant: Degussa AGInventors: Kai Schumacher, Helmut Mangold, Steffen Hasenzahl, Harald Alff
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Patent number: 5458923Abstract: Aqueous emulsions are disclosed containing organosilicon compounds for the impregnation of inorganic materials, in particular building materials, containing alkoxysilanes and silane surfactants. The aqueous emulsions are storage stable and are adjusted to pH of from 3 to 5.5 just prior to use.Type: GrantFiled: September 13, 1994Date of Patent: October 17, 1995Assignee: Degussa AktiengesellschaftInventors: Thomas Goebel, Rudolf Michel, Harald Alff, Josef Karl