Patents by Inventor Stefan Kohn
Stefan Kohn 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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Patent number: 11242792Abstract: Various embodiments include a method for the production of a sensor for an exhaust gas stream of an internal combustion engine, wherein the sensor comprises a first electrode and a second electrode. The method comprises: arranging a glass solder in a mold substantially between and substantially insulating the first electrode and the second electrode; arranging an insulating element in the mold in contact with a free surface of the glass solder; and finish molding the glass solder into a glass insulator together with the insulating element in a predetermined position relative to the first electrode and the second electrode. The insulating element shapes the glass insulator during the finish molding and at least partially isolates the glass insulator from the exhaust gas of the internal combustion engine during a measuring operation of the sensor.Type: GrantFiled: February 1, 2018Date of Patent: February 8, 2022Assignee: VITESCO TECHNOLOGIES GMBHInventors: Christoph Hamann, Kay Schwarzkopf, Stefan Kohn, Hajo Gugel, Tim Walde, Christian Kiefl
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Publication number: 20200011227Abstract: Various embodiments include a method for the production of a sensor for an exhaust gas stream of an internal combustion engine, wherein the sensor comprises a first electrode and a second electrode. The method comprises: arranging a glass solder in a mold substantially between and substantially insulating the first electrode and the second electrode; arranging an insulating element in the mold in contact with a free surface of the glass solder; and finish molding the glass solder into a glass insulator together with the insulating element in a predetermined position relative to the first electrode and the second electrode. The insulating element shapes the glass insulator during the finish molding and at least partially isolates the glass insulator from the exhaust gas of the internal combustion engine during a measuring operation of the sensor.Type: ApplicationFiled: February 1, 2018Publication date: January 9, 2020Applicant: CPT Group GmbHInventors: Christoph Hamann, Kay Schwarzkopf, Stefan Kohn, Hajo Gugel, Tim Walde, Christian Kiefl
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Patent number: 9500169Abstract: A lever device for a fuel injection valve includes a housing with a housing recess, at least one lever element arranged in the housing recess, a drive element arranged in the housing recess and coupled to the lever element(s) in order to act upon said at least one lever element in a direction of a force-action axis, and an output element arranged in the housing recess and coupled to the lever element(s) such that this output element is moveable in the force-action axis direction by the at least one lever element. Each lever element includes a coupling section designed or arranged such that the lever element is coupled to the housing, or to the output element, in a rotationally-fixed manner with respect to the force-action axis.Type: GrantFiled: December 19, 2012Date of Patent: November 22, 2016Assignee: CONTINENTAL AUTOMOTIVE GMBHInventors: Stefan Lehmann, Hellmut Freudenberg, Stefan Kohn, Robert Kuchler, Manuel Hannich, Roland Feigl, Wolfgang Wechler, Matthias Wicke
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Patent number: 9376993Abstract: A lever device for a fuel injection valve includes a housing with a housing recess, at least one lever element arranged in the housing recess and having a coupling section coupled to a section of the housing, a drive element arranged in the housing recess and coupled to the at least one lever element to act upon the at least one lever element in the direction of a force-action axis, and an output element arranged in the housing recess and coupled to the at least one lever element such that the output element may be moved in the force-action axis direction by the at least one lever element. The coupling section of the lever element has at least one recess that defines at least two coupling section contact surfaces spaced apart from one another and resting against the housing section.Type: GrantFiled: December 19, 2012Date of Patent: June 28, 2016Assignee: CONTINENTAL AUTOMOTIVE GMBHInventors: Stefan Lehmann, Hellmut Freudenberg, Stefan Kohn, Robert Kuchler, Manuel Hannich, Roland Feigl, Wolfgang Wechler, Matthias Wicke
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Publication number: 20150028135Abstract: A lever device for a fuel injection valve includes a housing with a housing recess, at least one lever element arranged in the housing recess, a drive element arranged in the housing recess and coupled to the lever element(s) in order to act upon said at least one lever element in a direction of a force-action axis, and an output element arranged in the housing recess and coupled to the lever element(s) such that this output element is moveable in the force-action axis direction by the at least one lever element. Each lever element includes a coupling section designed or arranged such that the lever element is coupled to the housing, or to the output element, in a rotationally-fixed manner with respect to the force-action axis.Type: ApplicationFiled: December 19, 2012Publication date: January 29, 2015Inventors: Stefan Lehmann, Hellmut Freudenberg, Stefan Kohn, Robert Kuchler, Manuel Hannich, Roland Feigi, Wolfgang Wechler, Matthias Wicke
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Publication number: 20150021418Abstract: A lever device for a fuel injection valve includes a housing with a housing recess, at least one lever element arranged in the housing recess and having a coupling section coupled to a section of the housing, a drive element arranged in the housing recess and coupled to the at least one lever element to act upon the at least one lever element in the direction of a force-action axis, and an output element arranged in the housing recess and coupled to the at least one lever element such that the output element may be moved in the force-action axis direction by the at least one lever element. The coupling section of the lever element has at least one recess that defines at least two coupling section contact surfaces spaced apart from one another and resting against the housing section.Type: ApplicationFiled: December 19, 2012Publication date: January 22, 2015Inventors: Stefan Lehmann, Hellmut Freudenberg, Stefan Kohn, Robert Kuchler, Manuel Hannich, Roland Feigl, Wolfgang Wechler, Matthias Wicke
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Patent number: 8264125Abstract: A piezoelectric component with a monolithic stack, has electrode layers and piezoceramic layers arranged alternately one on top of the other, the piezoceramic layers have a piezoceramic, and having at least one porous security layer arranged in the stack for the formation of a crack if mechanical overload of the stack should occur. The piezoelectric component has an infiltration barrier arranged between the security layer and a lateral surface section of the stack for suppressing the penetration of a foreign substance into the security layer. The piezoelectric component can be as a piezoactuator for controlling a valve, particularly a valve of an internal combustion engine.Type: GrantFiled: March 26, 2008Date of Patent: September 11, 2012Assignee: Siemens AktiengesellschaftInventors: Michael Denzler, Christoph Hamann, Harald Johannes Kastl, Stefan Kohn, Maximilian Kronberger, Christian Reichinger, Carsten Schuh, Claus Zumstrull
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Patent number: 7906888Abstract: An actuator for actuating a fuel injection valve has a piezoactuator, enclosed in an actuator housing unit (14, 16). The housing unit has a cylindrical actuator housing (14) which is elongate in its axial direction (A) and at least partially encased by an extruded plastic coat. The actuator housing unit (14, 16), in its encased area, is provided with a ventilation aperture (20) in which a ventilation element (22) produced from a microporous material is disposed.Type: GrantFiled: November 25, 2005Date of Patent: March 15, 2011Assignee: Continental Automotive GmbHInventors: Tim Bohlmann, Michael Denzler, Stefan Kohn, Klaus Plecher, Andreas Voigt, Claus Zumstrull
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Patent number: 7784444Abstract: A protective cover for an actuating drive, that can be used as universally as possible, for components (14, 16) of a contacting and/or sealing arrangement of the actuating drive. The sealing arrangement is embodied in a liquid-tight but gas-permeable manner and ends in a cavity on the outer side, the cavity being covered by a cover (28) held on the actuating drive by means of a catch connection (30, 32).Type: GrantFiled: March 21, 2006Date of Patent: August 31, 2010Assignee: Continental Automotive GmbHInventors: Tim Bohlmann, Michael Denzler, Stefan Kohn, Yavuz Kurt, Klaus Plecher, Emanuel Sanftleben, Marcus Unruh, Claus Zumstrull
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Publication number: 20100102138Abstract: A piezoelectric component with a monolithic stack, has electrode layers and piezoceramic layers arranged alternately one on top of the other, the piezoceramic layers have a piezoceramic, and having at least one porous security layer arranged in the stack for the formation of a crack if mechanical overload of the stack should occur. The piezoelectric component has an infiltration barrier arranged between the security layer and a lateral surface section of the stack for suppressing the penetration of a foreign substance into the security layer. The piezoelectric component can be as a piezoactuator for controlling a valve, particularly a valve of an internal combustion engine.Type: ApplicationFiled: March 26, 2008Publication date: April 29, 2010Inventors: Michael Denzler, Christoph Hamann, Harald Johannes Kastl, Stefan Kohn, Maximilian Kronberger, Christian Reichinger, Carsten Schuh, Claus Zumstrull
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Publication number: 20080197314Abstract: A fuel injector has a housing for an actuator (1), especially to a fuel injector with a connector of a contact stud support injection-molded thereto. The injector has a casing (10), disposed across at least part of the periphery of the actuator (1), and an actuator cover (20) placed on the casing (10). The actuator cover (20) is laser-welded to the casing (10) in an overlapping area (30) between the actuator cover (20) and the casing (10). According to a method for finishing the housing of a fuel injector having the aforementioned features, a laser beam used for a laser welding method is incident on the overlapping area (30) in a substantially perpendicular or substantially parallel orientation in relation to the axial direction (A) of the actuator (1) and laser-welds the actuator cover (20) to the casing (10).Type: ApplicationFiled: May 23, 2006Publication date: August 21, 2008Inventors: Tim Bohlmann, Michael Denzler, Stefan Kohn, Yavuz Kurt, Klaus Plecher, Emanuel Sanftleben, Marcus Unruh, Claus Zumstrull
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Publication number: 20080163853Abstract: A protective cover for an actuating drive, that can be used as universally as possible, for components (14, 16) of a contacting and/or sealing arrangement of the actuating drive. The sealing arrangement is embodied in a liquid-tight but gas-permeable manner and ends in a cavity on the outer side, the cavity being covered by a cover (28) held on the actuating drive by means of a catch connection (30, 32).Type: ApplicationFiled: March 21, 2006Publication date: July 10, 2008Inventors: Tim Bohlmann, Michael Denzler, Stefan Kohn, Yavuz Kurt, Klaus Plecher, Emanuel Sanftleben, Marcus Unruh, Claus Zumstrull
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Publication number: 20080149070Abstract: An actuator for actuating a fuel injection valve has a piezoactuator, enclosed in an actuator housing unit (14, 16). The housing unit has a cylindrical actuator housing (14) which is elongate in its axial direction (A) and at least partially encased by an extruded plastic coat. The actuator housing unit (14, 16), in its encased area, is provided with a ventilation aperture (20) in which a ventilation element (22) produced from a microporous material is disposed.Type: ApplicationFiled: November 25, 2005Publication date: June 26, 2008Inventors: Tim Bohlmann, Michael Denzler, Stefan Kohn, Klaus Plecher, Andreas Voigt, Claus Zumstrull
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Patent number: 7334329Abstract: In a method for pretreating a piezoelectric ceramic (1) and a method for adjusting an injection valve (7), the piezoelectric ceramic (1) is exposed to environmental conditions, leading to a reduction of polarization and also a reduction of the length of the ceramic (1). The obtained length exhibits a greater long-term stability due to said adjusting phase. Consequently, the injection valve (7) can be re-adjusted before use. As a result, renewed adjustment thereof is required only after a long period in service.Type: GrantFiled: July 30, 2004Date of Patent: February 26, 2008Assignee: Siemens AktiengesellschaftInventors: Matthias Goller, Stefan Kohn, Wolfgang Reisinger, Andreas Voigt, Claus Zumstrull
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Patent number: 7218037Abstract: A method is described for improving the long-term stability of a piezoelectric actuator encased in a potting compound containing or forming hydrogen atoms. Oxygen is contained in the piezoelectric actuator's piezoelectric ceramic. Appropriate means are employed so that unsaturated bonds of the hydrogen in the potting compound will release less oxygen from the piezoelectric ceramic. One means consists in reducing the concentration of hydrogen in the potting compound, with appropriate thermal processes as a result of which the concentration of hydrogen will be reduced to below a predefined threshold being applied after the piezoelectric actuator has been encased in the potting compound. Means that form bonds with the hydrogen in the potting compound or duct oxygen thereto are provided in further embodiments.Type: GrantFiled: July 26, 2005Date of Patent: May 15, 2007Assignee: Siemens AktiengesellschaftInventors: Michael Denzler, Stefan Kohn, Martin Neumaier, Roland Niefanger, Klaus Plecher, Andreas Voigt, Claus Zumstrull
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Publication number: 20070024160Abstract: A method is described for improving the long-term stability of a piezoelectric actuator encased in a potting compound containing or forming hydrogen atoms. Oxygen is contained in the piezoelectric actuator's piezoelectric ceramic. Appropriate means are employed so that unsaturated bonds of the hydrogen in the potting compound will release less oxygen from the piezoelectric ceramic. One means consists in reducing the concentration of hydrogen in the potting compound, with appropriate thermal processes as a result of which the concentration of hydrogen will be reduced to below a predefined threshold being applied after the piezoelectric actuator has been encased in the potting compound. Means that form bonds with the hydrogen in the potting compound or duct oxygen thereto are provided in further embodiments.Type: ApplicationFiled: July 26, 2005Publication date: February 1, 2007Inventors: Michael Denzler, Stefan Kohn, Martin Neumaier, Roland Niefanger, Klaus Plecher, Andreas Voigt, Claus Zumstrull
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Publication number: 20050017416Abstract: In a method for pretreating a piezoelectric ceramic (1) and a method for adjusting an injection valve (7), the piezoelectric ceramic (1) is exposed to environmental conditions, leading to a reduction of polarisation and also a reduction of the length of the ceramic (1). The obtained length exhibits a greater long-term stability due to said adjusting phase. Consequently, the injection valve (7) can be re-adjusted before use. As a result, renewed adjustment thereof is required only after a long period in service.Type: ApplicationFiled: July 30, 2004Publication date: January 27, 2005Inventors: Matthias Goller, Stefan Kohn, Wolfgang Reisinger, Andreas Voigt, Claus Zumstrull