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).

  • Patent number: 12268564
    Abstract: 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: Grant
    Filed: September 12, 2017
    Date of Patent: April 8, 2025
    Assignee: Dentsply Sirona Inc.
    Inventors: Lothar Volkl, Stefan Fecher, Andreas Gebhardt
  • Publication number: 20240041574
    Abstract: 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: Application
    Filed: October 20, 2023
    Publication date: February 8, 2024
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Markus VOLLMANN, Lothar VOLKL, Stefan FECHER, Carsten WIESNER
  • Patent number: 11833003
    Abstract: 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: Grant
    Filed: October 17, 2017
    Date of Patent: December 5, 2023
    Assignee: DENTSPLY SIRONA INC.
    Inventors: Markus Vollmann, Lothar Volkl, Stefan Fecher, Carsten Wiesner
  • Patent number: 11464608
    Abstract: 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: Grant
    Filed: October 8, 2019
    Date of Patent: October 11, 2022
    Assignee: DENTSPLY SIRONA INC.
    Inventors: Lothar Volkl, Martin Kutzner, Tanja Oefner, Stefan Fecher
  • Publication number: 20210338389
    Abstract: 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: Application
    Filed: July 14, 2021
    Publication date: November 4, 2021
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Lothar VOLKL, Martin KUTZNER, Heiner HORHOLD, Stefan FECHER
  • Patent number: 11090142
    Abstract: 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: Grant
    Filed: December 22, 2016
    Date of Patent: August 17, 2021
    Assignee: DENTSPLY SIRONA INC.
    Inventors: Lothar Volkl, Martin Kutzner, Heiner Horhold, Stefan Fecher
  • Patent number: 10842599
    Abstract: 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: Grant
    Filed: December 27, 2016
    Date of Patent: November 24, 2020
    Assignee: DENTSPLY SIRONA INC.
    Inventors: Lothar Volkl, Stefan Fecher
  • Patent number: 10799326
    Abstract: 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: Grant
    Filed: August 8, 2017
    Date of Patent: October 13, 2020
    Assignee: DENTSPLY SIRONA INC.
    Inventors: Andreas Gebhardt, Stefan Fecher, Lothar Volkl
  • Publication number: 20200030064
    Abstract: 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: Application
    Filed: October 8, 2019
    Publication date: January 30, 2020
    Applicant: DENTSPLY SIRONA INC.
    Inventors: Lothar VOLKL, Martin KUTZNER, Tanja OEFNER, Stefan FECHER
  • Patent number: 10531938
    Abstract: 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: Grant
    Filed: October 18, 2017
    Date of Patent: January 14, 2020
    Assignee: DENTSPLY SIRONA INC.
    Inventors: Markus Vollmann, Lothar Volkl, Stefan Fecher, Carsten Wiesner
  • Patent number: 10485640
    Abstract: 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: Grant
    Filed: December 22, 2016
    Date of Patent: November 26, 2019
    Assignee: DENTSPLY SIRONA Inc.
    Inventors: Lothar Volkl, Martin Kutzner, Tanja Oefner, Stefan Fecher
  • Patent number: 10441391
    Abstract: 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: Grant
    Filed: March 20, 2017
    Date of Patent: October 15, 2019
    Assignee: DENTSPLY SIRONA Inc.
    Inventors: Lothar Volkl, Stefan Fecher, Martin Kutzner, Tanja Oefner
  • Publication number: 20190099244
    Abstract: 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: Application
    Filed: October 17, 2017
    Publication date: April 4, 2019
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Markus VOLLMANN, Lothar VOLKL, Stefan FECHER, Carsten WIESNER
  • Publication number: 20190076222
    Abstract: 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: Application
    Filed: September 12, 2017
    Publication date: March 14, 2019
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Lothar VOLKL, Stefan FECHER, Andreas GEBHARDT
  • Publication number: 20190046305
    Abstract: 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: Application
    Filed: August 8, 2017
    Publication date: February 14, 2019
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Andreas GEBHARDT, Stefan FECHER, Lothar VOLKL
  • Patent number: 10105200
    Abstract: 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: Grant
    Filed: December 21, 2012
    Date of Patent: October 23, 2018
    Assignee: DEGUDENT GMBH
    Inventors: Stefan Fecher, Andreas Gebhardt, Martin Haizmann, Heiner Horhold, Elmar Hock, Lothar Volkl
  • Publication number: 20180104031
    Abstract: 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: Application
    Filed: October 18, 2017
    Publication date: April 19, 2018
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Markus VOLLMANN, Lothar VOLKL, Stefan FECHER, Carsten WIESNER
  • Publication number: 20170273764
    Abstract: 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: Application
    Filed: March 20, 2017
    Publication date: September 28, 2017
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Lothar VOLKL, Stefan FECHER, Martin KUTZNER, Tanja OEFNER
  • Publication number: 20170258563
    Abstract: 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: Application
    Filed: December 22, 2016
    Publication date: September 14, 2017
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Lothar VOLKL, Martin Kutzner, Tanja Oefner, Stefan Fecher
  • Publication number: 20170189146
    Abstract: 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: Application
    Filed: December 27, 2016
    Publication date: July 6, 2017
    Applicant: DENTSPLY SIRONA Inc.
    Inventors: Lothar VOLKL, Stefan FECHER