Patents by Inventor Lothar Volkl
Lothar Volkl 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: 12268564Abstract: The invention relates to a blank for the production of a molded body, in particular a dental reconstruction. The blank has a base and at least one region that emanates therefrom and projects above the base, from which at least a part of the molded body can be derived by working.Type: GrantFiled: September 12, 2017Date of Patent: April 8, 2025Assignee: Dentsply Sirona Inc.Inventors: Lothar Volkl, Stefan Fecher, Andreas Gebhardt
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Publication number: 20240041574Abstract: The invention relates to a method for the production of a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a mold and wherein the materials are pressed and after pressing are sintered. Thereby, a layer of the first ceramic material is filled into the mold, a first open cavity is formed in the layer, the second ceramic material is filled into the first open cavity and the materials are pressed together and are then heat-treated. Both the first ceramic material and the second ceramic material contain, or consists of, lithium silicate glass ceramic.Type: ApplicationFiled: October 20, 2023Publication date: February 8, 2024Applicant: DENTSPLY SIRONA Inc.Inventors: Markus VOLLMANN, Lothar VOLKL, Stefan FECHER, Carsten WIESNER
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Patent number: 11833003Abstract: The invention relates to a method for the production of a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a mold and wherein the materials are pressed and after pressing are sintered. Thereby, a layer of the first ceramic material is filled into the mold, a first open cavity is formed in the layer, the second ceramic material is filled into the first open cavity and the materials are pressed together and are then heat-treated. Both the first ceramic material and the second ceramic material contain, or consists of, lithium silicate glass ceramic.Type: GrantFiled: October 17, 2017Date of Patent: December 5, 2023Assignee: DENTSPLY SIRONA INC.Inventors: Markus Vollmann, Lothar Volkl, Stefan Fecher, Carsten Wiesner
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Patent number: 11464608Abstract: The invention relates to a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a die and wherein the materials are pressed and after pressing are sintered. A layer of the first ceramic material is thereby filled into the die and a first cavity formed in the layer, the second ceramic material is then filled into the first open cavity and the materials pressed together and then heat-treated.Type: GrantFiled: October 8, 2019Date of Patent: October 11, 2022Assignee: DENTSPLY SIRONA INC.Inventors: Lothar Volkl, Martin Kutzner, Tanja Oefner, Stefan Fecher
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Publication number: 20210338389Abstract: The invention relates to a blank from a ceramic material, wherein at least two layers of ceramic material of different compositions are filled into a die layer-by-layer and after filling of the layers they are then pressed and sintered, wherein after filling of a first layer this is structured on its surface in such a way that the first layer, viewed across its surface, differs in its height from region to region, and then a layer with a composition that differs from the first layer is filled as a second layer into the mold.Type: ApplicationFiled: July 14, 2021Publication date: November 4, 2021Applicant: DENTSPLY SIRONA Inc.Inventors: Lothar VOLKL, Martin KUTZNER, Heiner HORHOLD, Stefan FECHER
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Patent number: 11090142Abstract: The invention relates to a method for the preparation of a blank from a ceramic material, wherein at least two layers of ceramic material of different compositions are filled into a die layer-by-layer and after filling of the layers they are then pressed and sintered, wherein after filling of a first layer this is structured on its surface in such a way that the first layer, viewed across its surface, differs in its height from region to region, and then a layer with a composition that differs from the first layer is filled as a second layer into the mold.Type: GrantFiled: December 22, 2016Date of Patent: August 17, 2021Assignee: DENTSPLY SIRONA INC.Inventors: Lothar Volkl, Martin Kutzner, Heiner Horhold, Stefan Fecher
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Patent number: 10842599Abstract: The invention relates to a method for the production of a dental restoration from a blank, which has regions or layers of ceramic materials with differing compositions, under use of the method steps, filling of the ceramic materials into a mold, pressing of the ceramic materials to form a blank, removal of the blank from the mold, temperature treatment of the blank, wherein the ceramic materials are filling into the mold in such a way that layers and/or regions after temperature treatment have a profile that is available as a digital set.Type: GrantFiled: December 27, 2016Date of Patent: November 24, 2020Assignee: DENTSPLY SIRONA INC.Inventors: Lothar Volkl, Stefan Fecher
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Patent number: 10799326Abstract: The invention relates to a method for positioning a blank (116), which after insertion in a holder is in contact therewith, wherein the holder has a structural element. The blank (16) is positioned in the holder by way of an adapter (118), which is inserted in both the holder or the structural element and the blank, wherein the adapter positively engages with the holder or the structural element and with the blank.Type: GrantFiled: August 8, 2017Date of Patent: October 13, 2020Assignee: DENTSPLY SIRONA INC.Inventors: Andreas Gebhardt, Stefan Fecher, Lothar Volkl
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Publication number: 20200030064Abstract: The invention relates to a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a die and wherein the materials are pressed and after pressing are sintered. A layer of the first ceramic material is thereby filled into the die and a first cavity formed in the layer, the second ceramic material is then filled into the first open cavity and the materials pressed together and then heat-treated.Type: ApplicationFiled: October 8, 2019Publication date: January 30, 2020Applicant: DENTSPLY SIRONA INC.Inventors: Lothar VOLKL, Martin KUTZNER, Tanja OEFNER, Stefan FECHER
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Patent number: 10531938Abstract: The invention relates to a method for the production of a restoration from a blank consisting of, or containing, a lithium silicate glass ceramic, wherein at least two layers of ceramic material of different compositions are filled into a mold layer-by-layer and after filling of the layers they are then pressed and sintered, wherein after filling of a first layer this is structured on its surface in such a way that the first layer, viewed across its surface, differs in its height from region to region, and then a layer with a composition that differs from the first layer is filled as a second layer into the mold. After sintering the dental restoration is produced from the blank by mechanical working.Type: GrantFiled: October 18, 2017Date of Patent: January 14, 2020Assignee: DENTSPLY SIRONA INC.Inventors: Markus Vollmann, Lothar Volkl, Stefan Fecher, Carsten Wiesner
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Patent number: 10485640Abstract: The invention relates to a method for the preparation of a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a die and wherein the materials are pressed and after pressing are sintered. A layer of the first ceramic material is thereby filled into the die and a first cavity formed in the layer, the second ceramic material is then filled into the first open cavity and the materials pressed together and then heat-treated.Type: GrantFiled: December 22, 2016Date of Patent: November 26, 2019Assignee: DENTSPLY SIRONA Inc.Inventors: Lothar Volkl, Martin Kutzner, Tanja Oefner, Stefan Fecher
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Patent number: 10441391Abstract: The invention relates to a method for manufacturing a colored blank, which contains zirconium dioxide and is intended for the manufacture of a dental restoration, whereby raw materials in powder form, at least some of which contain one coloring substance each, are mixed with, zirconium dioxide as the main ingredient, the resulting mixture is pressed and subsequently subjected to at least one thermal treatment. To generate the desired fluorescence, it is intended that in the raw materials in powder form one uses as coloring substances at least terbium, erbium, cobalt, as well as one substance that generates a fluorescence effect in the dental restoration, however not iron, aside from naturally occurring impurities.Type: GrantFiled: March 20, 2017Date of Patent: October 15, 2019Assignee: DENTSPLY SIRONA Inc.Inventors: Lothar Volkl, Stefan Fecher, Martin Kutzner, Tanja Oefner
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Publication number: 20190099244Abstract: The invention relates to a method for the production of a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a mold and wherein the materials are pressed and after pressing are sintered. Thereby, a layer of the first ceramic material is filled into the mold, a first open cavity is formed in the layer, the second ceramic material is filled into the first open cavity and the materials are pressed together and are then heat-treated. Both the first ceramic material and the second ceramic material contain, or consists of, lithium silicate glass ceramic.Type: ApplicationFiled: October 17, 2017Publication date: April 4, 2019Applicant: DENTSPLY SIRONA Inc.Inventors: Markus VOLLMANN, Lothar VOLKL, Stefan FECHER, Carsten WIESNER
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Publication number: 20190076222Abstract: The invention relates to a blank for the production of a molded body, in particular a dental reconstruction. The blank has a base and at least one region that emanates therefrom and projects above the base, from which at least a part of the molded body can be derived by working.Type: ApplicationFiled: September 12, 2017Publication date: March 14, 2019Applicant: DENTSPLY SIRONA Inc.Inventors: Lothar VOLKL, Stefan FECHER, Andreas GEBHARDT
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Publication number: 20190046305Abstract: The invention relates to a method for positioning a blank (116), which after insertion in a holder is in contact therewith, wherein the holder has a structural element. The blank (16) is positioned in the holder by means of an adapter (118), which is inserted in both the holder or the structural element and the blank, wherein the adapter positively engages with the holder or the structural element and with the blank.Type: ApplicationFiled: August 8, 2017Publication date: February 14, 2019Applicant: DENTSPLY SIRONA Inc.Inventors: Andreas GEBHARDT, Stefan FECHER, Lothar VOLKL
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Patent number: 10105200Abstract: The invention relates to a method for producing a dental model for removable insertion in a recess of a holder, which dental model has a referencing, comprising at least one tooth part having a base to be inserted into the recess, wherein the at least one tooth part is produced using digitized data of a jaw in that the digitized data are saved in a computer beforehand and supplied to a processing machine to produce the at least one tooth part. In order to ensure simple handling of the dental model and in particular to prevent faulty insertion of the dental model or segment, according to the invention the referencing is saved in the computer and, in consideration of the referencing, the at least one tooth part is produced as having the base as a unit.Type: GrantFiled: December 21, 2012Date of Patent: October 23, 2018Assignee: DEGUDENT GMBHInventors: Stefan Fecher, Andreas Gebhardt, Martin Haizmann, Heiner Horhold, Elmar Hock, Lothar Volkl
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Publication number: 20180104031Abstract: The invention relates to a method for the production of a restoration from a blank consisting of, or containing, a lithium silicate glass ceramic, wherein at least two layers of ceramic material of different compositions are filled into a mold layer-by-layer and after filling of the layers they are then pressed and sintered, wherein after filling of a first layer this is structured on its surface in such a way that the first layer, viewed across its surface, differs in its height from region to region, and then a layer with a composition that differs from the first layer is filled as a second layer into the mold. After sintering the dental restoration is produced from the blank by mechanical working.Type: ApplicationFiled: October 18, 2017Publication date: April 19, 2018Applicant: DENTSPLY SIRONA Inc.Inventors: Markus VOLLMANN, Lothar VOLKL, Stefan FECHER, Carsten WIESNER
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Publication number: 20170273764Abstract: The invention relates to a method for manufacturing a colored blank, which contains zirconium dioxide and is intended for the manufacture of a dental restoration, whereby raw materials in powder form, at least some of which contain one coloring substance each, are mixed with, zirconium dioxide as the main ingredient, the resulting mixture is pressed and subsequently subjected to at least one thermal treatment. To generate the desired fluorescence, it is intended that in the raw materials in powder form one uses as coloring substances at least terbium, erbium, cobalt, as well as one substance that generates a fluorescence effect in the dental restoration, however not iron, aside from naturally occurring impurities.Type: ApplicationFiled: March 20, 2017Publication date: September 28, 2017Applicant: DENTSPLY SIRONA Inc.Inventors: Lothar VOLKL, Stefan FECHER, Martin KUTZNER, Tanja OEFNER
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Publication number: 20170258563Abstract: The invention relates to a method for the preparation of a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a die and wherein the materials are pressed and after pressing are sintered. A layer of the first ceramic material is thereby filled into the die and a first cavity formed in the layer, the second ceramic material is then filled into the first open cavity and the materials pressed together and then heat-treated.Type: ApplicationFiled: December 22, 2016Publication date: September 14, 2017Applicant: DENTSPLY SIRONA Inc.Inventors: Lothar VOLKL, Martin Kutzner, Tanja Oefner, Stefan Fecher
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Publication number: 20170189146Abstract: The invention relates to a method for the production of a dental restoration from a blank, which has regions or layers of ceramic materials with differing compositions, under use of the method steps, filling of the ceramic materials into a mold, pressing of the ceramic materials to form a blank, removal of the blank from the mold, temperature treatment of the blank, wherein the ceramic materials are filling into the mold in such a way that layers and/or regions after temperature treatment have a profile that is available as a digital set.Type: ApplicationFiled: December 27, 2016Publication date: July 6, 2017Applicant: DENTSPLY SIRONA Inc.Inventors: Lothar VOLKL, Stefan FECHER