Patents by Inventor Wolfram Holand

Wolfram Holand 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).

  • Method for the preparation of lithium silicate glasses and lithium silicate glass ceramics
    Patent number: 10737972
    Abstract: The invention relates to a method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. The invention also relates to a lithium silicate glass and a lithium silicate glass ceramic which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: August 11, 2020
    Assignee: Ivoclar Vivadent AG
    Inventors: Sebastian Krolikowski, Markus Rampf, Christian Ritzberger, Harald Bürke, Wolfram Holand, Marcel Schweiger
  • ZIRCONIA-TOUGHENED GLASS CERAMICS
    Publication number: 20190177210
    Abstract: ZrO2-toughened glass ceramics having high molar fractions of tetragonal ZrO2 and fracture toughness value of greater than 2 MPa·m1/2. The glass ceramic may also include also contain other secondary phases that may be beneficial for toughening or for strengthening through an ion exchange process. Additional second phases may also decrease the coefficient of thermal expansion of the glass ceramic. A method of making such glass ceramics is also provided.
    Type: Application
    Filed: June 26, 2017
    Publication date: June 13, 2019
    Inventors: George Halsey Beall, Marc Dittmer, Qiang Fu, Wolfram Holand, Markus Rampf, Christian Ritzberger, Charlene Marie Smith
  • METHOD FOR THE PREPARATION OF LITHIUM SILICATE GLASSES AND LITHIUM SILICATE GLASS CERAMICS
    Publication number: 20190039944
    Abstract: The invention relates to a method for the preparation of a lithium silicate glass or a lithium silicate glass ceramic which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. The invention also relates to a lithium silicate glass and a lithium silicate glass ceramic which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.
    Type: Application
    Filed: October 10, 2018
    Publication date: February 7, 2019
    Inventors: Sebastian Krolikowski, Markus Rampf, Christian Ritzberger, Harald Bürke, Wolfram Holand, Marcel Schweiger
  • Method For The Preparation Of Glasses And Glass Ceramics With SiO2 As Main Crystal Phase
    Publication number: 20180282204
    Abstract: The invention relates to a method for the preparation of a glass ceramic or a glass, which comprise cerium ions and are suitable in particular for the preparation of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. The invention also relates to a glass ceramic and a glass which can be obtained using the method according to the invention, the use thereof as dental material and in particular for the preparation of dental restorations, as well as a glass-forming composition which is suitable for use in the method according to the invention.
    Type: Application
    Filed: October 28, 2016
    Publication date: October 4, 2018
    Inventors: Markus Rampf, Sebastian Krolikowski, Christian Ritzberger, Wolfram Holand, Marcel Schweiger
  • Lithium disilicate apatite glass-ceramic
    Patent number: 9764982
    Abstract: Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: September 19, 2017
    Assignee: Ivoclar Vivadent AG
    Inventors: Christian Ritzberger, Wolfram Holand, Marcel Schweiger, Volker Rheinberger
  • LITHIUM DISILICATE APATITE GLASS-CERAMIC
    Publication number: 20160257607
    Abstract: Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.
    Type: Application
    Filed: May 17, 2016
    Publication date: September 8, 2016
    Inventors: Christian RITZBERGER, Wolfram HOLAND, Marcel SCHWEIGER, Volker RHEINBERGER
  • Composite ceramic material comprising zirconia
    Patent number: 9403721
    Abstract: The invention relates to a composite ceramic material which comprises: (a) a first phase based on zirconia containing CeO2 as stabilizer, and (b) a second phase based on an aluminate. The invention also relates to a ceramic powder composition, processes for the preparation of the composite ceramic material and the ceramic powder composition as well as uses thereof.
    Type: Grant
    Filed: October 16, 2014
    Date of Patent: August 2, 2016
    Assignee: Ivoclar Vivadent AG
    Inventors: Wolfram Holand, Elke Signer-Apel, Christian Ritzberger, Frank Rothbrust, Heinrich Kappert, Volker Rheinberger, Jerome Chevalier, Helen Reveron, Nicolas Courtois, Ricardo Dellagiacomo
  • Lithium disilicate-apatite glass-ceramic
    Patent number: 9371249
    Abstract: Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: June 21, 2016
    Assignee: Ivoclar Vivadent AG
    Inventors: Christian Ritzberger, Wolfram Holand, Marcel Schweiger, Volker Rheinberger
  • LITHIUM DISILICATE-APATITE GLASS-CERAMIC
    Publication number: 20150087493
    Abstract: Lithium disilicate apatite glass-ceramics are described which are characterized by a high chemical stability and can therefore be used in particular as restoration material in dentistry.
    Type: Application
    Filed: April 25, 2013
    Publication date: March 26, 2015
    Inventors: Christian Ritzberger, Wolfram Holand, Marcel Schweiger, Volker Rheinberger
  • Composite Ceramic Material Comprising Zirconia
    Publication number: 20150035210
    Abstract: The invention relates to a composite ceramic material which comprises: (a) a first phase based on zirconia containing CeO2 as stabilizer, and (b) a second phase based on an aluminate. The invention also relates to a ceramic powder composition, processes for the preparation of the composite ceramic material and the ceramic powder composition as well as uses thereof.
    Type: Application
    Filed: October 16, 2014
    Publication date: February 5, 2015
    Inventors: Wolfram Holand, Elke Signer-Apel, Christian Ritzberger, Frank Rothbrust, Heinrich Kappert, Volker Rheinberger, Jerome Chevalier, Helen Reveron, Nicolas Courtois, Ricardo Dellagiacomo
  • Lithium silicate glass ceramic and glass with transition metal oxide
    Patent number: 8759237
    Abstract: The invention relates to a lithium silicate glass ceramic, which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides. The invention also relates to a corresponding lithium silicate glass, a process for the preparation of the glass ceramic and of the glass as well as their use.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: June 24, 2014
    Assignee: Ivoclar Vivadent AG
    Inventors: Christian Ritzberger, Wolfram Holand, Marcel Schweiger, Volker Rheinberger
  • Lithium silicate glass ceramic and glass with ZrOcontent
    Patent number: 8536078
    Abstract: Lithium silicate glass ceramics and glasses containing at least 6.1 wt.-% ZrO2 are provided which can advantageously be applied to zirconium oxide ceramics in particular by pressing-on in the viscous state and forming a solid bond with the zirconium oxide ceramics.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: September 17, 2013
    Assignee: Ivoclar Vivadent AG
    Inventors: Christian Ritzberger, Ricardo Dellagiacomo, Marcel Schweiger, Harald Burke, Wolfram Holand, Volker Rheinberger
  • Lithium silicate materials
    Patent number: 8444756
    Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: May 21, 2013
    Assignee: Ivoclar Vivadent AG
    Inventors: Marcel Schweiger, Volker Rheinberger, Harald Burke, Wolfram Holand, Elke Apel, Christian Ritzberger, Dmitri Brodkin
  • Primary particles coated with a chromophoric component
    Patent number: 8329296
    Abstract: The invention relates to primary particles of oxide-ceramic material, wherein the primary particles have an average particle size in the range from 10 to 1000 nm and are coated with a chromophoric component, a process for their preparation and their use in particular in the preparation of ceramic moldings and dental restorations. The invention further relates to a suspension based on oxide-ceramic material which contains the primary particles, and a process for the preparation of a ceramic moldings.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: December 11, 2012
    Assignee: Ivoclar Vivadent AG
    Inventors: Elke Apel, Christian Ritzberger, Wolfram Holand, Christoph Appert, Wolfgang Wachter, Volker Rheinberger
  • Lithium silicate materials
    Patent number: 8047021
    Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: November 1, 2011
    Assignee: Ivoclar Vivadent AG
    Inventors: Marcel Schweiger, Volker M. Rheinberger, Harald Burke, Wolfram Holand
  • Lithium silicate materials
    Patent number: 8042358
    Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: October 25, 2011
    Assignee: Ivoclar Vivadent AG
    Inventors: Marcel Schweiger, Volker M. Rheinberger, Harald Burke, Wolfram Holand
  • Composite Ceramic Material Comprising Zirconia
    Publication number: 20110254181
    Abstract: The invention relates to a composite ceramic material which comprises: (a) a first phase based on zirconia containing CeO2 as stabilizer, and (b) a second phase based on an aluminate. The invention also relates to a ceramic powder composition, processes for the preparation of the composite ceramic material and the ceramic powder composition as well as uses thereof.
    Type: Application
    Filed: April 13, 2011
    Publication date: October 20, 2011
    Applicant: IVOCLAR VIVADENT AG
    Inventors: Wolfram Holand, Elke Apel, Christian Ritzberger, Frank Rothbrust, Heinrich Kappert, Volker Rheinberger, Jerome Chevalier, Helen Reveron, Nicolas Courtois, Ricardo Dellagiacomo
  • Lithium silicate glass ceramic and glass with transition metal oxide
    Publication number: 20110257000
    Abstract: The invention relates to a lithium silicate glass ceramic, which contains at least 8.5 wt.-% transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals with an atomic number from 41 to 79 and mixtures of these oxides. The invention also relates to a corresponding lithium silicate glass, a process for the preparation of the glass ceramic and of the glass as well as their use.
    Type: Application
    Filed: April 4, 2011
    Publication date: October 20, 2011
    Applicant: IVOCLAR VIVADENT AG
    Inventors: Christian RITZBERGER, Wolfram HOLAND, Marcel SCHWEIGER, Volker RHEINBERGER
  • Lithium silicate glass ceramic
    Patent number: 7871948
    Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools and which subsequently can be converted into lithium silicate products showing high strength.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: January 18, 2011
    Assignee: Ivoclar Vivadent AG
    Inventors: Elke Apel, Wolfram Holand, Marcel Schweiger, Christian Ritzberger, Harald Burke, Volker M. Rheinberger
  • Lithium Silicate Materials
    Publication number: 20110009254
    Abstract: Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.
    Type: Application
    Filed: July 9, 2010
    Publication date: January 13, 2011
    Applicant: Ivoclar Vivadent AG
    Inventors: Marcel Schweiger, Volker Rheinberger, Harald Burke, Wolfram Holand, Elke Apel, Christian Ritzberger, Dmitri Brodkin