Patents by Inventor Lothar Hofmann

Lothar Hofmann 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).

  • Patent number: 11624403
    Abstract: The invention relates to a method for producing a rolling bearing ring featuring an improved robustness against the formation of white etching cracks (WEC), wherein the rolling bearing component, which is made of a hypo-eutectoid heat-treated steel containing C in an amount of 0.4-0.55% and Cr in an amount of 0.5-2.0% in order to form a hardened boundary layer, is inductively heated, then quenched and subsequently tempered.
    Type: Grant
    Filed: November 7, 2017
    Date of Patent: April 11, 2023
    Assignee: SCHAEFFLER TECHNOLOGIES AG & CO. KG
    Inventors: Lothar Hofmann, Andreas Mangold, Toni Blass, Wolfram Kruhoeffer, Werner Trojahn
  • Publication number: 20220025581
    Abstract: A method for producing a thermal insulating paper includes producing the thermal insulating paper in a classic paper production process from a raw material having materials with good thermal properties and materials with electrically insulating properties in a paper matrix. A thermal insulating paper produced using the above method may include inorganic fibers, electrical insulators, aramid fibers, or binders.
    Type: Application
    Filed: November 20, 2019
    Publication date: January 27, 2022
    Applicant: Schaeffler Technologies AG & Co. KG
    Inventors: Stefan Steinmetz, Gregor Mattern, Lothar Hofmann
  • Publication number: 20200300303
    Abstract: The invention relates to a method for producing a rolling bearing ring featuring an improved robustness against the formation of white etching cracks (WEC), wherein the rolling bearing component, which is made of a hypo-eutectoid heat-treated steel containing C in an amount of 0.4-0.55% and Cr in an amount of 0.5-2.0% in order to form a hardened boundary layer, is inductively heated, then quenched and subsequently tempered.
    Type: Application
    Filed: November 7, 2017
    Publication date: September 24, 2020
    Applicant: SCHAEFFLER TECHNOLOGIES AG & CO. KG
    Inventors: Lothar HOFMANN, Andreas MANGOLD, Toni BLASS, Wolfram KRUHOEFFER, Werner TROJAHN
  • Patent number: 10137413
    Abstract: An oxidation catalyst is described for treating an exhaust gas produced by a diesel engine. The oxidation catalyst comprises: a substrate; a capture material for capturing at least one sulfur containing impurity in the exhaust gas produced by the diesel engine; wherein the capture material comprises a metal for reacting with an oxide of sulfur in the exhaust gas and particles of a refractory oxide, wherein the particles of the refractory oxide have a mean specific surface area ?50 m2/g; and a catalytic region disposed on the substrate; wherein the catalytic region comprises a catalytic material comprising a platinum group metal (PGM) selected from the group consisting of platinum (Pt), palladium (Pd) and a combination of platinum (Pt) and palladium (Pd).
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: November 27, 2018
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Kieran Cole, Lothar Hofmann, Calum Robertson
  • Publication number: 20180036680
    Abstract: An oxidation catalyst is described for treating an exhaust gas produced by a diesel engine. The oxidation catalyst comprises: a substrate; a capture material for capturing at least one sulfur containing impurity in the exhaust gas produced by the diesel engine; wherein the capture material comprises a metal for reacting with an oxide of sulfur in the exhaust gas and particles of a refractory oxide, wherein the particles of the refractory oxide have a mean specific surface area ?50 m2/g; and a catalytic region disposed on the substrate; wherein the catalytic region comprises a catalytic material comprising a platinum group metal (PGM) selected from the group consisting of platinum (Pt), palladium (Pd) and a combination of platinum (Pt) and palladium (Pd).
    Type: Application
    Filed: August 4, 2017
    Publication date: February 8, 2018
    Inventors: Kieran COLE, Lothar HOFMANN, Calum ROBERTSON
  • Patent number: 8136243
    Abstract: The invention relates to a method for producing an internal combustion engine piston which is provided with at least one cooling channel (12) and at least one reinforced piston ring groove (14) consisting in producing a piston blank (1), in forming a groove (10) provided with a cooling channel (12) and an external ring (11) in said piston blank (1), in filling the cooling channel (12) with are movable material (2), in filling the external ring with a reinforcing material (3) in removing the removable material (2) and in finish-machining the piston. A piston made of aluminum alloy and produced according to the inventive method is also disclosed.
    Type: Grant
    Filed: August 9, 2006
    Date of Patent: March 20, 2012
    Assignee: Federal-Mogul Nurnberg GmbH
    Inventors: Simon Reichstein, Lothar Hofmann, Peter Konrad
  • Patent number: 7507684
    Abstract: The invention relates to an extruded solid catalyst body for breaking down nitrogen oxides in the presence of a reducing agent as well as to a process for manufacture of said body. The solid catalyst body has an active material that contains 60 to 87% by weight of an ion-exchanged zeolite containing at least one metal from the group containing Cu, Hf, La, Au, In, V, lanthanoids and transition metals of group VIII of the periodic system, more than 10 to 37% by weight of aluminum oxide and 2 to 10% by weight of inorganic fibers. The solid catalyst body, the active material of which contains a zeolite can be manufactured by extrusion and has a high degree of mechanical stability at a high catalytic activity.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: March 24, 2009
    Assignee: Argillon GmbH
    Inventors: Lothar Hofmann, Jörg Münch, Ralf Dotzel
  • Publication number: 20090000470
    Abstract: The invention relates to a method of producing a piston (1) with a combustion chamber recess (2) for an internal combustion engine, in which at least one region of the combustion chamber recess (2) comprising at least one recess base (20) is melt-treated in order to re-melt a material in the melt-treated region, so that a buildup of the material in the melt-treated region is changed in a layer with a definable depth, and relates to such a piston (1).
    Type: Application
    Filed: June 26, 2006
    Publication date: January 1, 2009
    Inventors: Simon Reichstein, Lothar Hofmann
  • Publication number: 20080250640
    Abstract: The invention relates to a method for producing an internal combustion engine piston which is provided with at least one cooling channel (12) and at least one reinforced piston ring groove (14) consisting in producing a piston blank (1), in forming a groove (10) provided with a cooling channel (12) and an external ring (11) in said piston blank (1), in filling the cooling channel (12) with are movable material (2), in filling the external ring with a reinforcing material (3) in removing the removable material (2) and in finish-machining the piston. A piston made of aluminium alloy and produced according to the inventive method is also disclosed.
    Type: Application
    Filed: August 9, 2006
    Publication date: October 16, 2008
    Inventors: Simon Reichstein, Lothar Hofmann, Peter Konrad
  • Publication number: 20080000444
    Abstract: The invention relates to a piston for an internal combustion engine, which consists of a copper alloy. According to the method for producing such a piston, said piston is produced from a copper alloy. According to the invention, a copper alloy is used in the production of a piston for an internal combustion engine.
    Type: Application
    Filed: March 9, 2005
    Publication date: January 3, 2008
    Applicant: FEDERAL-MOGUL NUERNBERG GMBH
    Inventors: Lothar Hofmann, Klaus Lades, Karl-Heinz Obermeier
  • Publication number: 20070259770
    Abstract: The invention relates to an extruded solid catalyst body for breaking down nitrogen oxides in the presence of a reducing agent as well as to a process for manufacture of said body. The solid catalyst body has an active material that contains 60 to 87% by weight of an ion-exchanged zeolite containing at least one metal from the group containing Cu, Hf, La, Au, In, V, lanthanoids and transition metals of group VIII of the periodic system, more than 10 to 37% by weight of aluminum oxide and 2 to 10% by weight of inorganic fibers. The solid catalyst body, the active material of which contains a zeolite can be manufactured by extrusion and has a high degree of mechanical stability at a high catalytic activity.
    Type: Application
    Filed: December 29, 2006
    Publication date: November 8, 2007
    Inventors: Lothar Hofmann, Jorg Munch, Ralf Dotzel
  • Patent number: 6737033
    Abstract: The method and the device are configured for the catalytic removal of a pollutant contained in an exhaust gas of a combustion system using a reagent. A temporal mean, or time average, is formed for the concentration of the pollutant in the exhaust gas. The catalytic converter is laid out for complete conversion if the reagent is introduced stoichiometrically. Here, the reagent is introduced in substoichiometric proportions with respect to the time average of the pollutant content.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: May 18, 2004
    Assignee: Siemens Aktiengesellschaft
    Inventors: Lothar Hofmann, Wieland Mathes
  • Patent number: 6620391
    Abstract: Exhaust gas to be cleaned is introduced into a conversion and mixing duct and the exhaust gas flows through the duct along a predetermined longitudinal direction. A reducing agent, such as aqueous urea solution, is injected into the exhaust gas stream in the conversion and mixing duct. The exhaust gas stream is then deflected into a reaction duct which extends parallel to or coaxially around the conversion and mixing duct. The exhaust gas then flows in the opposite direction through the reaction duct. A reduction catalyst is disposed in the reaction duct, where the reducible components of the exhaust gas are reduced. The exhaust gas cleaned in this manner is then discharged from the reaction duct.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: September 16, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Raimund Müller, Lothar Hofmann, Kurt Schardt, Wieland Mathes
  • Patent number: 6553755
    Abstract: A static mixer in the exhaust emission control system of an excess-air-operated combustion engine is formed of an expanded grid with a plurality of openings formed between crossbars. Using an expanded grid achieves both good mixing of the exhaust gas with a reducing agent in a short mixing path and properly aligns the exhaust flow.
    Type: Grant
    Filed: April 25, 2002
    Date of Patent: April 29, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Lothar Hofmann, Wieland Mathes, Udo Klumpp
  • Patent number: 6539708
    Abstract: A metering system in a combustion unit having an exhaust-gas chamber and a reducing agent reservoir includes an electrically controllable valve for introducing the reducing agent into the exhaust-gas chamber without using compressed air. The valve has an outlet opening that opens directly into the exhaust-gas chamber. The outlet opening is fluidically connected to the reservoir through the valve. The metering system can be produced with only little technical outlay. The metering system includes a recirculating circuit, and the valve has a holding chamber for the reducing agent. The holding chamber is disposed downstream of the outlet opening in a reducing agent flow direction, and is fluidically connected into the recirculating circuit. The metering system includes a coolant circuit for cooling the valve.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: April 1, 2003
    Assignee: Siemens Aktiengesellscahft
    Inventors: Lothar Hofmann, Wieland Mathes
  • Publication number: 20020187093
    Abstract: Exhaust gas to be cleaned is introduced into a conversion and mixing duct and the exhaust gas flows through the duct along a predetermined longitudinal direction. A reducing agent, such as aqueous urea solution, is injected into the exhaust gas stream in the conversion and mixing duct. The exhaust gas stream is then deflected into a reaction duct which extends parallel to or coaxially around the conversion and mixing duct. The exhaust gas then flows in the opposite direction through the reaction duct. A reduction catalyst is disposed in the reaction duct, where the reducible components of the exhaust gas are reduced. The exhaust gas cleaned in this manner is then discharged from the reaction duct.
    Type: Application
    Filed: July 24, 2002
    Publication date: December 12, 2002
    Applicant: Siemens Aktiengesellschaft
    Inventors: Raimund Muller, Lothar Hofmann, Kurt Schardt, Wieland Mathes
  • Patent number: 6475453
    Abstract: A configuration for decomposing nitrogen oxides in a gas stream includes a plurality of catalytic converters disposed one after the other through which the gas stream can flow. Each of the catalytic converters has a honeycomb structure with many parallel cells through which the gas stream can flow. Each of the catalytic converters also has a predetermined cell density and a predetermined average level of activity defined as a proportion by weight of the catalytically active agent. The predetermined cell density of a second catalytic converter through which the gas stream flows after a first catalytic converter is lower than the predetermined cell density of the first catalytic converter. The predetermined average level of activity of the second catalytic converter is also higher than the predetermined average level of activity of the first catalytic converter. The configuration is preferably used in conjunction with an exhaust gas from a combustion drive unit.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: November 5, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wieland Mathes, Lothar Hofmann, Frank Witzel
  • Patent number: 6471927
    Abstract: A microwave hydrolysis reactor for converting urea into ammonia has one or more reaction chambers into which a urea solution is fed via a feed device and a discharge device for discharging an ammonia-water mixture. A catalytic converter is arranged in the reaction chamber. A microwave-transmitting device allows irradiating so that energy is fed to the urea solution in the reaction chamber.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: October 29, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Lothar Hofmann, Klaus Rusch
  • Patent number: 6470676
    Abstract: A method is provided for the catalytic conversion of nitrogen oxides contained in the exhaust gas of an internal combustion engine. A reducing agent is added in a controlled manner upstream of a denitrification catalyst, as seen in exhaust gas flow direction, and in dependence on a nitrogen oxide concentration. The reducing agent is added in a superstoichiometric amount in relation to the nitrogen oxide content if an operating parameter and/or a value derived from the operating parameter falls below or exceeds a threshold value. The addition of the reducing agent is then terminated or continued in a substoichiometric manner. The invention provides a measure for obtaining an extremely high average nitrogen oxide conversion, especially under varying operating conditions of the internal combustion engine.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: October 29, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Winfried Dölling, Lothar Hofmann
  • Patent number: 6442932
    Abstract: To ensure the maximum possible conversion of nitrogen oxides in a DeNOx catalytic converter in an off-gas cleaning installation for reducing nitrogen oxides and, at the same time, to prevent the reducing agent which is used for the reduction from escaping into the environment, there is provision for the density of a reducing agent solution to be used to determine the volume of the reducing agent solution which is to be metered. The density is regulated in two ways, in that the temperature of the reducing agent solution is measured using a temperature sensor and set by a temperature-control device.
    Type: Grant
    Filed: October 24, 2000
    Date of Patent: September 3, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Lothar Hofmann, Günther Pajonk, Manfred Weigl, Gerhard Wissler